In the post before yours I suggested trying Benadryl to see if some sort of allergic reaction might be involved. You have done this already, and it seems to give you some relief. However, there appear to be other problems, as indicated by a positive ANA, increased Sed rate, etc. that appear to be cyclic.
I really feel that these signs/symptoms could be the result of a chronic infection(s) (the relapse when you are strressed also fits with this notion). We see similar signs/symptoms in patients who have chronic intracellular bacterial infections, especially the rashes and Lupus-like symptoms. Often these patients and their physicians are confused, because it is often difficult to clearly diagnose Lupus. Thus such patients usually receive a diagnosis of atypical Lupus or no diagnosis at all.
Prof. Garth Nicolson