I've had the exact same thing affect me a few times in the past. Comes from a variety of things including a lot of golf. Mine was a mixed bag of golf and the use of the weed-eater and leaf blower in the summer months. Two ways you can go about it to help and correct the problem. Massage the area that hurts for several minutes pretty aggresively (per my wife she is a physcial therapist) a few times a day, wear a arm strap directly over the area that hurts designed for tennis elbow along with ibuprofen or stop all activities involving the affected limb for a few months. I opted for the first option, helped immediately.