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The best specialist would be either a rheumatologist or clinical immunologist. I can understand what you say, but the diagnosis would entail quite a bit of immunological tests (blood work up) and some imaging studies. It is difficult to say about the diagnosis without a physical examination but mixed connective tissue disorder, lupus, fibromyalgia, lyme disease, rheumatoid arthritis, undifferentiated connective tissue disease, etc. would be in consideration.