Jed, I've been standing where you're standing. It's a frightening thing to go through. I'm glad that you were able to walk away from it.
Getting to a doctor to get yourself checked out is a good idea. If you heard your body go "crack" in a lot f place the damage or pain may not be give you pain for a while, but it you may be able to head it off if your doctor finds and starts treating it now.

Stephen