INCREASED APPETITE!! My doctor took me off anxiety medicine and ...

INCREASED APPETITE!! My doctor took me off anxiety medicine and put me on Wellbutrin XL. I've been on it for two days and I have a constant headache, can't get out of bed because I'm so tired, and my appetite was so big that I ate enough calories for 3 adults. I weigh 120 lbs and don't plan on gaining anymore weight. I called my doctor regarding the side effects and he said "stop taking it". Of course I'm not a doctor, but this is the first "depression" medication I've been on and don't feel I am a depressed person. Maybe my doctor is a quack.