What Causes Testicle Pain And Burning Sensation On Penis Tip After Unprotected Intercourse?

I had unprotected oral and unprotected intercourse last Thursday with my wife. On Sunday the tip of my penis began to feel like its burning and today my testicle began to hurt. My wife feels fine. I have no discharge and no pain when I urinate. My urine is fairly clear. I am going to see the doctor in two days. Any ideas?