Talk to General Physician on Severe Pain In Legs And Arms And Hips

My mother is having severe pain in arms legs and hips since last 3 years .. she is unable to sleep at night because of pain..sometimes if she woke up at midnight she feels shivering or suffer from (hath paon ka sun hjana ) her legs are getting thinner day by day .. loosing mass ... 1 year before sugar test was done and it came normal .. so my question is what could be the problem ? And is problem ki diagnosis k liye konse test krwane chahye ?? Knsi medication help lre gy arms and legs k pain ko khatam krne k liye ??