question: hi doc my name is farwa m from pakistan . age 25 . i am nt well since 20013. i feel weekness in my whole body specially in legs. i got tested twice . for all the rutine tests n and all tests were normal eccept Ra factor it was positive . after that doctor gave me vitamin b complex tabs till now i am using them but my legs are weak more than the first time i visited my doctor . and i cant move my whole body easily . my muscles are kinda rigid ,stiff and now m also facing back pain .muscles stiffness is more on right side and also i have double vision problem since day one of this problem