I think there must be something else that is making me nauseous. The specialist told me he didn't know what the problem is and this is the third specialist I've been to that doesn't have a clue. DEar E. Germano, It is possible but unlikely that the gastritis is the cause of your symptoms of nausea. Your extensive workup has excluded many of the causes for nausea. Gastritis can be overdiagnosed by endoscopic appearnace.
Biopsies are necessary for a diagnosis.
If you have diagnosis one must consider alcohol, nonsteroidal agents, atrophic gastritis among the possible causes. Specific treatment will depend on the cause and severity of any gastritis. This information is presented for educational purposes. Ask specific questions to your personal physician. Information contained within this forum is intended solely for general educational purposes and is not intended nor implied to be a substitute for professional medical advice relative to your specific medical condition or question.