<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am 43 years old, female, and over the past year was dieting and lost about 20 pounds now about 120 pounds. Two months ago I started to get severe gas and then about ten days ago started to get diarrhea but only after dinner. Diarhea has stopped but now having abdominal pain--at lower part o abdomin, like intestinal pain. help!  <response>: Hi. The most probable treatment for such an Abdominal Pain with Diarrhea, a waterborne disease can be a course of an antibiotic, Metronidazole, Tablets against worms, antispasmodics, Probiotics and supportive therapy. If there is no relief within a few days you can go for consultation of a Surgical Gastroenterologist and Investigations like that of stool, blood, urine, ultrasonography and CT scan of the abdomen. There is a possibility of Gastrointestinal Cancer that has to be ruled out. Colonoscopy or Upper GI Endoscopy can be planned according to the CT scan report for diagnosis, biopsy and treatment plan. 