Hi Graybird, Please try not to think the worst! Your doctor should have told you exactly why he was ordering this test, but I suppose that doctors are so used to ordering tests like these that they don't bother to discuss them with the patient.
Sad!! The test you are having is given mainly to see what is going on in the small intestine. It can be done to rule out any disease or problem.
Years ago, I was hospitalized for diverticulitis (not at all what you have), and a barium enima with contrast was ordered. I was so worried! It did turn out that I have numerous diverticula in my colon, but the radiologist (bless her heart!) assured me right after the test that many people have lots of diverticula and get along fine. This eased my mind while I awaited my next appt. with the surgeon.
So, I would advise you to not worry. It won't help and will just cause anxiety which can't help anything. Good luck! Mabent