I have recently been put on 200mg quetiapine a day. since starting them i have lost my appetite completely and i can't sleep. what should i do?

Quetiapine: Why was the quetiapine prescribed? This does not usually cause insomnia, but some of the disorders for which it might be prescribed can. I suggest contacting your doctor asap about these effects. Hoping you're working with a psychiatrist who can fully evaluate and help you with what's happening -- especially since your response is an uncommon one.