Just as another anecdotal data point, I can testify that my first and worst encounter with a kidney stone was so excrutiatingly painful and nausea inducing that it did indeed cause me to vomit from the pain. And I normally have a reasonably high pain threshhold ( so it seems, anyway ).
Possibly with sudden blows. But I can testify that severe pain doesn’t always cause vomiting. I had a vasectomy in which the anesthetic didn’t take on one side and I told the doc to go ahead and finish as half a clipping wasn’t going to do me a lot of good.
Yes, I am one of the toughest men you know. But I damn well knew I wasn’t letting him open me up down there a second time.
Pain. Severe pain of that special kind. But no nausea.
Oh yeah, it happens. When I was in basic training we went through the obstacle course. One of the obstacles was a high wall we had to scale. I leaped up and was in the process of swinging my leg over when the next guy decided to be “helpful” by giving me a boost. I lifted about a foot up and then landed square on my sacred possessions. I swear I heard them crunch.
I fell off the wall, about 8 feet, and just lay there holding myself. I then puked all over my drill sergeant’s boots.
The guy who had pushed me avoided me for about a week, afraid that I’d return the favor.
Stopped one while keeping wicket without a box to one of our faster bowlers. Much writhing around on the ground gasping for breath, but no regurgitation.
One the ladies’ side: I once slipped on the ice and landed on my tailbone with my legs in a perfect split. I broke my tailbone and the rebound made me hit my crotch on the ice. I don’t even have the male equipment, but I did puke.
While playing a particularly savage game of croquet, I took a shot to the pills from a croquet ball that had been fired directly at me by a disgruntled opponent (we were kids at the time). The initial pain just made me grab my balls and gasp. It wasn’t until I dropped suddenly to my knees, thereby joggling the freshly injured oysters, that I blew chunks, which I then fell into when I put my hand down to steady myself and it slipped in the puke. All in all, a very memorable event.