DesertPanda.
I spent extra time on this because it fits one of my specific interests. However, to get to the main points:
1) You used MDMA in that past, stopped for a few years, used again and had a bad "trip" that included full blow panic attack.
Often, people describe having used drugs for some time, then taking a break and then only using a small amount and it having a very strong/negative impact. The complex symptoms of HPPD/DPD/VSS are usually part of a multiple step process. It isn't just one thing that does it, but it can (or at least is reported. By itself, this is not a significant indicator or much more than MDMA will never be like it used to be and I have tried the same thing, many years later with a batch I can say I was certain of purity and it just made me feel "F'd up" and if I had not had supportive meds it would have been much worse.
2) This is KEY BACKGROUND INFORMATION (others take note): BAD EXPERIENCE WITH MARIJUANA even before HPPD. If I had to put something as a predictor not to take hallucinogens (this would be it).
You said a few things that show you really don't like it, but it seems that you were pretty involved in drugs and still used it many times (This would be a time to definitely stay away. I am not anti-drug, but when it sounds like you have a drug-related and lasting change in your perception then don't use it again.
I didn't smoke while we were using Ecstasy and LSD. After taking a more than moderate amount of an adulterated pill sold as Ecstasy (It was not MDMA, and the markings on the pill later being associated with 2-CB) I woke up the next morning and my perfect vision was blurry and it felt like the most annoying parts of a hallucinogenic experience just kept going. They continued for 2 weeks like this. Then my friends took MDMA -- being an addict who wanted to join them somehow and this is 1998, so I had no idea what I could have but what harm could smoking pot have? I don't like it, but better than nothing, right?
Was I wrong. HPPD Symptoms went from 8 to 12. Now, looking outside I watched homes undulating with colors and shifting. VIsual snow/static seemed to double. The taste in my mouth was worse. Those symptoms went down to a 10 after a few months. With medication some of those symptoms are down to a 4, but I also am on an addictive substance that controls my life.
So, when I hear you say: I have tried weed many times, and I'm one of those people that hallucinates and freaks out. Even small amounts (5mg of THC) is enough to make me nauseous and feel detached from my body, and actually smoking elicits the aforementioned hallucinations. "
These happened before starting Agmatine. It looks like Agmatine has a lot of biochemical pathways and it is understandable why it is used, why research has blown up on it since it was discovered to have genetic code to sequence for the enzyme for agmatine (Link to genetic map location)
Now to the post in general:
Don't worry, our unofficial motto should by these three phrases. While it isn't good that you aren't finding satisfactory responses elsewhere, it makes us sound like the Elite unit of the Internet that has heard all sorts of unique stories and we are pretty good.
I am going to re-write your post in my own words, it won't be 100% accurate, but if I get something significantly wrong let me know:
1) Years ago, you used MDMA and reached a point when you were taking much more than the pill to one pill and 1/2 after a few hours that would have worked before.
2) It is fair to say that that majority of your experiences were pretty good, but eventually the rewards wasn't worth the side effects of having to take the higher dose ranges.
3) Like many MDMA users who stopped, we are in a situation where it is available and we remember the great times and we take it again after having taken a few years of a break from it.
4) A few months ago, you decided to try MDMA again. A moderate dose for you, but it was significant because you are calling it a "bad trip". It produced a full panic attack.
5) As part of a your work-out routine, you decided to buy and take agmatine sulfate, 750mg per serving. It is going to increase pumps. Why, you probably know that there are 20 different pathways to how it could happen. (More on this)
6) It is banned in the EU as a performance enhancer, but it appears this is more of a technicality but Her Majesty's General Chemist warned to needing improved measures for it because it can be found in other things.
7) It is not banned in the USA. But, there is a lot of research on how it could affect the body: It can reduce pain during work outs. By increasing nitric oxide it can enhance sex (guys will inject NO directly into their body) it is a vasodilator (another reason good for performance enhancing). I can see what it would be popular. I looked at the marketing of it and generally as expected: It is natural. It is essentially an amino acid. It can do all of these great things. It isn't banned, so it is good. Truthfully, it makes sense. Is there data to support the claim it helps, definitely. Do they tell you it has many possible effects on the brain, no. But, those help and hurt.
8 ) As you discovered, something euphemistically referred to as "hangover" from it sounds pretty severe: "muffled hearing, blurry vision, dissociation, elevated heart rate, detachment, anxiety, nausea, etc." I would see why it would not be easy to put the supplement together with these symptoms. As you eventually discovered, the compound has so many possible mechanisms and effects different systems that there is a surprising jump in literature published about it after they discovered it was genetically endogenous in mammals. Research of it as a neurotransmitter, it potential treatment for depression to helping parts of Autism to a drug that can help manage opiate withdrawal or manage the effectiveness of opiates. (https://nyaspubs.onlinelibrary.wiley.com/doi/abs/10.1196/annals.1304.009)
9 ) You have tried weed many times. Mentioned this. It is very significant.
10) For the past month (I know what rolling should feel like and Tuesday Bluesday is not even remotely the same experience, so lets go with the Tuesday Bluesday [for those who haven't taken MDMA, we usually took MDMA on weekends and the day that we would feel the worst depression and other negative effects would be on Tuesday, so Terrible Tuesday and other nicknames got assigned for good reason. After that day, you were pretty much back to normal. The day before, not so bad.).
11) Hearing is muffled // eyes are blurry // LEDs make the star // recurring anxiety similar to the panic attack felt originally. Having a history with MDMA and then a negative experience with it later on that caused panic attacks is a common theme with something described that happened before onset of HPPD/HPPD-like symptoms
Having AWFUL experiences with pot. Hallucinating on pot. These are also very consistent with people who have post-drug perceptual changes and with HPPD who have symptoms get worse with pot use even once. I have a lot of papers now on agmatine , but to summarize I can't go into any of the theory related to muscarinic cholinergic receptors of any type and HPPD as a predictor/etc or a reason to explain it (this is interesting because the chemical has SO many ways of acting in the brain that I have to sort through it over a week to get a reasonable understanding . However, it is a neuroactive compound that brought on a similar drug-effect from the past (anxiety/etc) and your vision is blurry and LED's are making stars. These visuals are very consistent with HPPD, as is having derealization or depersonalization.
I am not a doctor. And it would be dangerous for a doctor to diagnose you over the internet. Everything sounds like experiences directly related to a drug experience, and this is part of the part that make people not want to believe in the diagnosis: Agmatine is not a hallucinogen. But, it sounds like this was the final part of three experiences that contributed to the where you are now. You should definitely see a doctor, and I describe your symptoms came after taking this supplement that you discovered had many neurological affects. It is really easy to look up, and it reminds you of past drug experiences. You want to rule out anything else, because I don't want you to be harmed as a result.
You are exercising. This is good. You may notice symptoms get worse with it.
Your post was an excellent example of a few important clues that are often missed unless put together. Make the doc appt. Check in if things are worse/better. Hopefully everything goes away tomorrow and we never hear back from you. But if that isn't the case, I would have additional questions and can provide you the documents that I downloaded that may help you on a personal journey to find possible links with this receptor system and the drugs action.
Best wishes,
David