I Have Taken Synthroid For Years And A Lot Of

i have taken synthroid for years and a lot of different antidepressants. now my phyciatrist has started me on different anti.phychotic meds trying to find one that doesn't make me feel worse, like constant weight gain, nausea dissiness, insomnia ect. he just started me on a new antiphscotic callec VRAYLAR which seems to be the same. should i just be taking a plain depession med for depession and insomnia or nothing. seems to me he just wants to get more money for the antiphycotic drugs as VRAYLAR costs around 1200.00 for 30 days.can you suggest a good antidepressant other than prozac ca as i am allergic to it.causes pancriatitis. also i cannot afford anymore weight gain, i am up to 250 pounds and am 62 years old any advise would be great.