question: I have a cyst on my left epididymis that is around 3cm.  I have a dull ache there most of the time and cannot do things like riding a bike without extreme pain that radiates to my abdomen.  However, every 6-12 months after having lots of sex (wife, no STD) the pain gets worse and i feel nauseous all the time.  Is this caused by an infection in the cyst?