I got treatment from osteopath (a kind of doctor/chiropractor hybrid) for tendinitis with some nerve impingement. He tried cortisone shots on my elbow, didn't last. What finally resolved the issue was very long and slow warm-ups before playing, ice on the elbow and down my forearm after playing, and every two weeks I'd visit him and he would simply manipulate my forearm tendons and muscles - like a task-specific extremely deep tissue massage. I'd definitely have to ice my arm after the massages! It took about 8 months, but now I play mostly pain free. If I start to experience some symptoms again - numbness, soreness, tightness, or pain when gripping things - I go back to icing after playing or just before going to bed. Usually a couple nights of that nips it in the bud now. I can't recommend an osteopath enough, he took a very holistic approach from both alternative and "normal" drug-and-surgery based medicine, plus he had the healing touch. I also changed my work setup (day job on computers) and that helped too.