Hi. Thanks for your query. Noted your history of being diagnosed of Irritable bowel syndrome. Yo were operated twice - once for cancer of colon and another for treating twisted bowel.Occasionally you are constipated but most of the times there can be diarrhea. You also have food allergies, gluten intolerance and also a celiac disease. Since you have multiple problems, all the things should be tackled one by one to get the results. I would advise you the following: Enteroclysis to know any problems in the intestines. CT scan of the abdomen., Upper GI endoscopy Colonoscopy and biopsy. Therapeutic trial with many medicines and to continue the ones which serves the purpose. This is going to be a permutation and combination of multiple therapies, stoppage of all the foods and beverages that are acting as instigating or enhancing factors. Medications under the guidance of Gastroenterologist.