I think you have affective symptoms and psychosis symptoms which are persistent. I cannot diagnose you, but I do not think your providers are wrong. Considering your prescribers would put you on these meds to gain weight is a symptom in itself. It is a delusion.

If you are truly worried about the weight, have a conversation about it. Some psych meds are more weight friendly than others. None of them are aimed at weight gain, but they can cause it as a side effect.

You're not well MM. Trying to refute your diagnosis won't help. Acceptance and working a plan to address your symptoms is the only way forward. Hugs.