I get bouts of nausea lasting 2-3 days every few weeks, sometimes resulting in vomiting. why? how do i stop it? i had tonsils out 2 months ago.

Nausea: I presume you're not pregnant. Are you taking any medications or supplements that could be producing nausea? Are headaches also present? Can you pinpoint certain foods or beverages that bother you? Are there bowel irregularities that suggest irritable bowel syndrome? A gastroenterologist is best qualified to perform a gi investigation and will order appropriate testing and medication.