Hi. Thanks for your query. Noted the history of feeling hungry but feels weird on eating, vomited today almost 13 times and all liquids, also have diarrhea, not gotten the periods since November... Such a problem comes when one suffers from gastroenteritis: 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, anti-spasmodics, 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 Gastrointesinal 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.