Nausea and pain can certainly be caused by
SphincterAnal sphincter anatomy
Inflatable artificial sphincter of Oddi dysfunction. I am not sure if too little acid in the stomach can cause nausea, but I suppose it may be possible. To determine this you may want to consider a 24-hr pH study.
I would say rule out inflammation or ulcers, but with a negative upper endoscopy - this would make it less likely.
To fully evaluate for SOD, you may want to consider an ERCP with Sphincter of Oddi manometry - it is suggested that you discuss this option with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b