I am sorry you are having a hard time with weight gain, it's so prevalent with so many psych meds.
I have to count calories in order to lose weight.
I calculate my basal metabolic rate (calculators found with internet search) and keep daily intake below that daily caloric intake calculation.
I have lost 25lbs. in less than three months by doing this and still losing each week.
I have stayed on many meds while losing.

WC