Hi. Thanks for your query. Noted the history about your husband having microscopic colitis, no appetite, debilitating diarrhea for which the Gastroenterologist has given some powder which is not helping him . This means the patient is still suffering and hence needs more appropriate treatment. I would advise you the following: Take a second opinion of another Gastroenterologist and go for repeat tests of stool, blood, urine, ultrasonography and take proper medications and see the results. The treatment may be in the form of an antibiotic, metronidazole, probiotics and symptomatic for the complaints. You have to strictly make a list of the foods and beverages that do not suit your stomach and stop them altogether, it is you who has to observe keenly and make a list of these. Stress and anxiety cause a lots of problems and hence should be in control for successful treatment. Repeat colonoscopy can help further.