So psychosis is really rough on the brain. You're lucky you recovered in 3 weeks, that gives you a better prognosis than anything beyond 1 month. For me I felt slow for at least six months but I read about neuroplasticity and started to do brain games and puzzles...things like luminosity and brain age for the ds as well as posh logic puzzles that come in book form. I also read as much as possible and picked up the guitar...wasn't good at it but learning a new thing was key....I wanted to keep my brain active. I also bought some of those CDs from the great courses and played a game called set. Basically I was treating myself like I was brain damaged and I had to remake all the connections I had in my brain. I feel totally like myself now so I consider myself recovered.