That's ridiculous. (the doctor's replies).
If you have a primary care doctor you are satisfied with (for the most part), you need to see him. Or get a new doctor. If you belong to an HMO, just ask at the desk for a new doctor to be assigned to you. At my HMO they have sort of their own version of YELP! to help pick out doctors. But out of an HMO there are services that help patients find doctors.
Perhaps bring a list of your symptoms.
One strategy that MIGHT help is to create a food log. you could just make one with paper and pencil. but its not much more trouble to create one in Cronometer. If you have some symptoms - make a note of them in the proper place on the food log.
There is a pretty simple blood test for Celiac's disease. As I mentioned earlier there was a study that provided that test to people and a lot of people were diagnosed with Celiac's disease who did not know they had it.
There is not a good test for gluten sensitivity. In fact, some doctors now dismiss the condition as one that is something else entirely. or actual Celiac's.
FYI.
There is a blood test for IBS, too. Actually, it's two tests.
Anyway, see a doctor and ask for these blood tests. I would also ask for a food allergy screening test.
Let us know what happens. We are rooting for you.