Aw MM, I found seroquel extremly sedating, more so than some other ap's. Some people adjust to it and the sedation wears off a bit. But if you are taking it as a prn that isn't likely. I used to split my seroquel and my dr was fine with that, so yes I would assume so.
Ok what about getting some electolites at least? I have no idea about thyroid meds but what have you been drinking? I remember you drink mountain dew..I have a good memory for things like that

but I don't know if you have been managing to get other fluids with it. Electrolites because for one, prolonged anorexia shrinks your heart and causes other heart disturbances, and because elextrolite imbalance has a direct negative effect on your heart and tend to get imbalanced when dehydrated. Anorexics are kinda prone to heart failure so that always freaked me out a bit. Not that electrolites is a cure for not having heart failure but can't hurt and I worry about you.
Maybe pedialite, or coconut water...nun tablets even. You will feel much shitier till you restore hydration. I can understand not wanting to take the meds, since I do not know a lot about that I won't weigh in there. Well my dr told me ap's can't cause one to feel like a zombie.. if nothing else that is good for a laugh.