My sister has been suffering with stomach pain, diarrhea, sudden weight loss. She does have a hx of diverticulitis but they have ruled that out as the problem. They did a colonoscopy but I feel she might need to have GI testing. Do you hgavcew any suggestions on what they can check for. They are not giving her any answers. They put her on a diet but she was alread following a very similar diet before they ordered this one.