Hi, I ve had a swollen epididymis for a year now. The pain and swelling normally comes about after a prolonged period of arousal or after ejaculation. It doesn t hurt immediately after but only when I urinate 3/4 hours later (it also stings). After urination the pain proceeds. I haven t got an STI, ultrasound was fine and so was the blood tests. I m very bemused and fed up of this, especially after I ve just got a girlfriend. Please can you give me an insight on what s wrong if you can?