Had a particularly bad bout about 10 years ago when I was about 31. Had the classic swollen face version which started to clear up after a week at which point it spread down to my balls (called orchitis). First the left one, after a week that started to ease, and then it went across to my right. They were the size of baked potatoes. The pain, oh god the pain. There were times when I could only crawl to get around. Fever, hallucinations, massive weight loss. Did I mention it was painful? The pain in my balls literally made me vomit what little food and fluids I had left in me. Woke up hallucinating one night and Superman was helping me across the bedroom floor to get to the loo. Then he flew out the window and I collapsed, smashed my head on a door frame and knocked myself clean out. I woke up to my current girlfriend shouting and crying and the sound of sirens outside as an ambulance turned up.
There, hope that cheered you up 🙂