Drastic weight loss, severe bloating, pelvic pain, fatigue, daily diarrhea 5'1 116lbs 38" waist, nausea , back pain, thin everywhere but belly, cause?

MD Crystal ball: As a MD, we don't have a crystal ball to foresee a complex of symptoms "sight unseen" and make an accurate determination of that diagnosis.(cause). We (MD's) do have the ability to assess a problem with a complete history and physical as well as ancillary testing. In other words, you need to make an appointment with a "live" not virtual MD to find your answer.