I had to go to the ER once because my left testicle was in extreme pain. I had testicular problems before, but it was a dull pain; my ER experience involved a very sharp pain. And I mean sharp. As in, I couldn't urinate, defecate and I was vomiting a lot, in addition to feeling really light headed.
When I went to the ER for my sharp pain, the doctor said that because the pain went away before she gave me an ultrasound (I'm not pregnant, in case anyone's wondering), that it could have been one of two things: excess hydrocele in my sac (which caused my dull pain) or a twisted testicle. Since there was no way to tell, and because I was feeling better, she sent me home.
And the end to this marvelous night was followed by me getting woken up 4 hours later by a
phone call due to an inept manager at my work failing to pass on the message to the next manager that I wasn't coming into work that day.
23 hours awake and 4 hours of sleep because of testicle problems. How fun.