Hi Helena, welcome to the forum and thanks for sharing.
I would say that your case is more likely to be VSS and I think you will have more success with doctors if you describe it as such. There is a case to be made that the ADHD med caused this though, amphetamines could potentially cause HPPD, though it seems rare (anecdotally).
From what I have read though, the treatments, triggers and overall advice seems to be pretty much the same for VSS and HPPD, so the info you find on the forum will be relevant.
And yes, it can definitely go away... There are plenty of success stories on this site, and I get a lot of DMs letting me know that people have got better over time. It's something that often seems to go away after a few months.