I got 'em exactly a month after I was hit by a bus and thought I had pinched a nerve in my back or something.
Woke up at 5am and it felt like my lower bike/spine was exploding and like my right testicle was literally being twisted off.
Pain was so bad I was on the floor making wimpy sounds and then ten minutes later would feel fine again.......then bam instant pain drop to the floor.
Spent several hours in the ER wondering what the hell was going on and had an MRI and was told it was only kidney stones. Got pumped up full of morphine and given a ton of pain pills.
Now whenever I'm least bit dehydrated (often) I feel instant pain in my kidneys for some reason.
This happened two years ago.