The muscles in the top of my arms are very weak, this has resulted in my shoulder arm joints crunching/cracking when I move. I have limited reach - high - behind (eg reaching back to lower the height of the seat belt). I have suffered from CFS for ten years. I have been given exercises to do and am going in for a CT both shoulders. My neck is continuously stiff, top four bones jut, have been using pain away, Celebrex, mersyndol .....