Since last summer, when serving more than a few times in a row, i get this sharp pain on lower end of the tricep above the elbow - and lesser pain in the bicep and in the elbow itself. I stopped serving for a few weeks recently, but I just practiced some serves and it returned with a vengeance. I get this only when serving, especially when the toss is off and I extend the arm too much. It doesn't prevent me from hitting other shots, but hurts like hell for a few hours and sometimes overnight. Any idea of what it might be and what I can do to fix it? Thanks!!