Pins and needles

I am a 46yr old female....I am experiencing tightness in my left thigh and noticed muscle loss. At night my
toes will tingle and my leg jumps. Can't sleep unless I have a few cocktails to knock me out. I also have the
pins and needle feeling in my hands and arms. So much that I scratch my skin and now it has become a rash
throughout my body. I have had this rash for five months along with these other issues. I have gone to an allergist for my rash and he gave me prednisone,claritin and zantac plus some topical cream. It has not gone away yet.
Any thoughts??