My first thought reading your post was kidney stone. Those can be extremely painful, and the pain can start and stop very suddenly. If it passed, you might never have an issue with it again. But some people, for reasons I don't know, have a tendency to get them, so you might get one again. If that is even what it was.

Other thoughts... if you were in pain that bad... why did you drive yourself? That is dangerous!

Also this probably just reveals that I'm a female that has no real idea about these things, but I interpreted your statement about feeling like you got kicked in the testicle as a metaphor to explain the intensity of the extreme amount of pain you were feeling. Other people seem to be taking it more literally. But would you feel that in your stomach?

Since it might be something serious, I'd at least consult with a doctor about it. Explain to the doctor as you did to us that you don't want a lot of tests done for nothing. If the doctor seems to think there is a concern and still wants to do tests, then you can at least listen to his/her reasons and make a decision from there.