What Causes Severe Pain In The Right Elbow?

I am a 52 year old fairly healthy male. I have always been active with my work as a cabinetmaker and my out of work activity of mountain biking, I recently had a shoulder surgery due to a crash on my bike. I was in a sling for 6 weeks and am now active in physical therapy. My shoulder was on my left arm but last Friday when I woke up I had some severe pain in my right elbow. It was sore and tender. The pain was mostly just above the elbow. By the end of that day, the pain had gone away and back to normal. This morning I woke up and had the same thing on the left elbow. This time the pain was not as severe but it also did not go away. It still feels the same way it did when I woke up. Any thoughts?