I have been on quetiapine for 4 days and although I always feel hungry, I feel no different other than that. Should I stop taking it?

As above. Quetiapine is atypical anti psychotic medication, and yes it can cause weight gain, but also it may be helpful for u condition. It is best to discuss this with u pcp for dose adjustment if needed.
See your Doc. It will be best to discuss your concerns with your prescribing physician. Maybe, a dose or medication reassessment will be needed.