I’ve underwent general anesthesia several times. From my experience, it feels very weird and strange when they are administering it, but you only experience that for a few seconds before you are knocked out (and I didn’t find it scary, just a weird feeling). Then when I woke up, I felt mostly the way I normally feel. That is, my normal messed up DP’ed self. I wasn’t given any Xanax, Valium, or anything else though, but I imagine you shouldn’t have any special problems.