I have seen several rheumatologists, and had every test done under the sun. My symptoms..fatigue, muscle pain, loss of flexibility, and others, seem to fit Mixed connective tissue, but the tests don't really confirm it. Could something else be going on here? I am currently being tested for celiac disease. What other kind of practitioner could I consult? I believe the "lens" that a rheumatologist looks through can sometimes limit them to only certain possibilities.