Arm soreness

I started throwing a few months back and my arm was fine until a couple of weeks ago. I somehow developed a sharp pain in my outer forearm/ elbow joint. It hurts right in the elbow joint and feels like it sort of runs up my bicep. I used to get sore near my funny bone on the inside of my elbow and now I have this pain on the outter part of my arm where the forearm and bicep connect. What might I have injured and how can I help it?