I didn’t feel any of those side effects. However, I had a really bad “main effect”, in the sense that I just couldn’t come in the session. FMD it was hell… That stuff really fucks with your brain!
Hope you don’t mind me asking, are you circumcised? That can cause PE, especially if your foreskin is particularly long. It makes your dickhead always covered and therefore very very sensitive to any external touch. That could be a better solution.