A nod to Thomas on a clinic but for one thing. Im quite sure the way in which Dr. Practice medicine in places in the US may be quite different then in Sweden. In most clinics in the US you might not ever get as far as having a Dr. even agree to test you for this. Most Dr. in the US would just as soon spend vast amounts of money testing you for any number of autoimmune diseases for which they have very expensive pharmaceuticals standing by. The very idea of healing through a change in diet and some natural products goes antithetical to the way Dr. are educated in this country. But hey give it a try by all means.
But after your visit to a clinic, check in with an MD who practices integrative medicine.