What just happened?

A little backstory first, I got HPPD back in August of 2016 from mushrooms, and while I don't have the worst case of HPPD its been a real struggle for me in the last couple months. So I was in class today, just paying attention to the lecture when I was hit with a euphoric head rush, similar to the feeling of nicotine. As I was being hit with this I noticed my brain fog disappeared and my visual snow lessened, It was almost like I felt normal again. About 20 minutes later I noticed the brain fog and VS started to return, but not as bad as they were before, even now hours after I experienced this my symptoms still feel somewhat better.

Has anyone else experienced anything like this before?