My HPPD was bad-trip induced; the trip was not on acid, however.
I did two cones of weed, within a relatively short period of time. I then inhaled some popper and realised I had gotten the effects of Poppers Maculopathy (a yellow spot in my central vision). Well, that was exactly the kind of thing to throw me into a bad time.
I was so high and worried that I passed out. When I awoke, I could still see the yellow spot. This almost broke me down - I had had visual problems in the past, and had just gotten over them. For new ones to arise was just a nightmare to me.
A week later, my HPPD symptoms started slowly appearing. I didn't know whether they were real or not, as they developed slowly. I continued smoking weed regularly, and did a lot the next weekend. The symptoms were getting worse until I did some research and realised what I was experiencing.
I now have palinopsia pretty bad. I can also see visual snow, and have some DR. It's been at least three months since this all happened.
I'm not sure why the symptoms developed, and developed at the time and rate they did. One reason could be due to my intense bad experience, coupled with the increased sensitivity to my vision - I was checking for that yellow spot over and over again, hoping that it was just a bad dream. I have also done LSD a few times in the past. Also, I realise now that I had been experiencing DP/DR for years due to my existing anxiety (which I had pretty bad, and still have to some degree).
Not sure if any of this helps. Writing and talking about this stuff helps to some degree, but in other ways it can be unhelpful. I think that if you are experiencing HPPD, the more it affects your day the more you suffer. And so talking about it too often can make it affect your day more, and therefore make you suffer more. So yeah... unsure if this is helpful or not.