Marle,
My daughter takes seroquil for bi polar disorder and it really helps her. She takes it before bed time and therefore she is not affected by its sleepy side effects. When she gets up she if fine. She also did not gain weight on it. She was on lithuim and she gained weight on that. No longer on that drug. I guess it is different for everyone.
Good luck to Megan with her descision. My daughter's meds are also her descision, they know what is right for them.