Heavy arms accompanied by pain and loss of function

Dear All,

I have relapsing remitting MS and in December I started suffering from a new relapse where my arms became heavy and painful. This was then accompanied by loss of function in fine and major motor function. I also have burning / crawling sensation in my arms. These symptoms persist following a course of strong steroids in March and on a quite high dose of Gabapentin. Has anyone had the same sort of thing and have you had physio or excercises recommended to help with the symptoms?