Various possibilities are there.Do you get stomach ache and diarrhea only after eating a particular food or as such also?Is it accomapanied by any other sign or symptom?
The bowel problems of diarrhea and nausea after eating may be due to GERD(gastro esophageal reflux disease), acute non-GI infections (pyelonephritis, pneumonia),gastroenteritis,liver diseases, pancreatic disorder,peptic disease of upper GI tract,gastric carcinoma,CNS diseases like infections, tumors, multiple sclerosis and metabolic disturbances like diabetes and adrenal insufficiency.
I sincerely advise you to consult a physician/gastroenterologist and discuss these with him.Without examintion,confirmation of a diagnosis is tough,so ple get yourself evaluated from a physician.
Hope it helps.Take care and pls do keep me posted if you have any additional queries.Kind regards.
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