I have been nauseous and vomiting the past few days no fever and not pregnant. what could this be?

Sure, but...: ...We're going to need a little more help from you. We can have your answer if you tell us the location of your queasiness, its intensity, duration, timing (with meals, urination, stooling) & accompanying issues like fever (U said "no"), tenderness, vomiting, bleeding, etc, & circumstances (exposures, pregnant [U said "no"], stressed). Also, what tests have been done to exclude some possibilities?