Oh.

Guess what? Ulnar nerve damage is not as funny as one would imagine. Also, did you know that for someone with Raynaud's Disease, smashing the ulnar nerve can cause symptoms of Raynaud's without any temperature drops? Awesome! I still can't feel the fingers on my right hand. It's fantastic.
I did not know this, but I found out at two in the morning, when I was in the bathroom and smashed my forearm against a wall corner, directly on that ulnar nerve. It's very easy to drop to your knees and see stars at this point.
Also, being in a fibromyalgia flare does not make it easier.