Nausea & vomiting every morning not pregnant. 4 months pp.been twice to the er in the last 3 months and the keep saying stomach flu. what is cause?

ER: This is not the place in which to undergo evaluation for a chronic process. This needs careful assessment with history, physical exam and labs and possibly endoscopy or other procedures and should be done by a doctor with the time and training to do this. An ER, although staffed by wonderful concerned doctors, in not equipped for this. Go see a GI doctor. Good luck and hope this clears up soon.