Pain in hand, knee joint, lower back, neck and muscle fatigue, wht it could b? Ra factor, serum c-reac= -ve, cbc, tsh, k, calcium, CPK all test normal

Polymyalgia? You might have polymyalgia rheumatica, for which there is no diagnostic test. Obviously you are seeing a physician about this already, you should discuss possible diagnoses and what to do about them with him/her.