I'm 26 years old and since nearly 5 years ago I have got an injury in my back. I was at gym doing the exercise called "Incline Dumbbell Flyes" and all of a sudden when I opened (streched) my arms I felt an extremely sharp pain near the muscle called "teres minor muscle" and "levator scapulae" (I don't know exactly whether they are the right muscles but anyway I feel the pain near of them). I really don't know what more I could do in order to alleviate and cure this pain. It is killing me. Please, help me.