I cannot make specific recommendations without knowing your case personally.
The nausea should be further evaluated with an upper endoscopy or upper GI series. These tests can evaluate for GERD, an ulcer or inflammation of the upper digestive tract.
The diarrhea should be further tested with a colonoscopy, which can look for colitis or inflammatory bowel disease.
If the tests remain negative, irritable bowel disease can be more appropriately treated. Increasing fiber in the diet, antispasmodic agents, or tricyclic antidepressants are all treatment options.
These options should be discussed with your personal physician, or in conjunction with a GI consult.
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 patients education only. Please see your personal physician for further evaluation of your individual case.