Hi, I am female 57 year old in very good health. For the last approximately 2 weeks I have had a pain in my left shoulder moving up and down the arm and I mean sometimes very severe pain! Settles sometimes in my muscles deltoid, biceps, elbow joint, wrist, shoulder I mean the works! I never had this before and its bothering me. What could this be and how do I get rid of it asap? Help