I have a burning pain (imagine a bolt of lightning) that runs from the top of my shoulder to my elbow, especially when my arm is extended while driving. The pain is distracting and often makes my fingers ache as well. I cannot take muscle relaxers (I commute a long distance and they make me drowsy) and gabapentin causes a major headache within 30 minutes after ingestion... Does the pain sound like bursitis or perhaps something else? I have suffered with shoulder pain for over 20 years, as well as tendonitis in my elbow. Any ideas?