Hi! Sweetie! Sorry you are having such a rough time!
You aren't alone with weight, have gained a little over 35 lbs. Probably my neuron tin & have fibro too so not very active.
I do not take seraquel & if you need an antipsychoitic, don't know any others that wouldn't make you gain weight, like ziprexia or respiridal.
Have you tweaked what you're on now, like more lamictal (I know it's a mood stabilizer) & less seraquel. Unless you have to take that much at hs for sleep & keep "the demons" away. Maybe you'd be less hungry & feel better about yourself & the urge to SI wouldn't be so strong.
That's about all I got, don't know or remember... any of the older drugs, well haldol but has the tar dive dyskenesia risk, I don't know how high of a dose of it you'd have to be on for it to be that risky.
Just suggestions here, wish I could be more help. Surely you'll get more post with more meds to look up to help you.
You are in my thoughts, big time!