I'm glad you might have found a good med. Let us know how you're doing on it.
The problem with these meds is they often cause muscle degeneration and increasing appetite so of course you gain then. But if you, indeed, watch what you eat, you'll gain less. But the point is to be able to live comfortably (without voices/hallucinations/delusions etc.) and being hungry all the time is just not that.
Anyway. Good luck
Lovelovelove!
Tineke