TERES MAJOR MUSCLE INJURY

CAN ANYONE HELP?? I HAD AN UNKNOWN INJURY THAT OCCURRED SEVERAL YEARS AGO, THAT LEFT MY RIGHT ARM IN THERAPY FOR A YEAR, UNABLE TO LIFE IT FROM MY SIDE, EXTREME PAIN IN THE ELBOW AND ON TOPSIDE ABOVE THE ELBOW WITH SWELLING AND EXTREME PAIN IN THE FOREARM MIDWAY BETWEEN THE ELBOW AND THE WRIST. THE PAIN I AM LEFT WITH AFTER ALL OF THIS IN THE TERRES MAJOR MUSCLE, AND UNDER THE RIGHT ARM, WITH CONTINUOUS KNIFELIKE JABS OF PAIN UNDER THE THE ARM, AND THE INABILITY OF THE SHOULDER OR SHOULDER WING BONE TO STAY IN ITS POSITION. DOES ANYONE HAVE ANY IDEA, DIAGNOSIS, TREATMENT THAT WILL ALLOW ME TO GET RELIEF FROM THE PAIN. RIGHT NOW, I CANT SLEEP, HARDLY FUNCTION, YET I MUST WORK AND MY FIELD IS THE HEALTHCARE FIELD, SO IT IS MAKING IT EXTREMEMLY DIFFICULT. ANYONE!!