I Have Left Arm Pain From The Shoulder To The

I have left arm pain from the shoulder to the elbow. I am 46. I got into an auto accident in 2013 with bruising to this area. No findings on x- ray. Approx six months ago I had a shot in this arm and this is when the pain started,I do not know if this is just a coincidence.I am on 500 mg ibuprofen with no improvemt for months , it isgetting worse-and when I put ice on the arm for 20 minutes there is a pronounced red mark from just below the shoulder to right above the elbow. I cannot lift my arm above my head and wake up often and move a certain way during the day with sharp shooting pain that is so intense I cry. I am not on any other medications