Lucky you landed on your backside and not your noggin.
My nephew is a Quarter horse trainer in Texas (mostly roping and heeling - he won Reserve World Champion at the World Quarter Horse Congress in OKC a couple of years back) and a year or so ago he took a major fall and landed on his head. At the end of the day he was still complaining of neck pain to his girlfriend, who's father happens to be surgeon. They went to his office, got him x-rayed, and he was immediately put into an ambulance and sent off to Dallas to see a specialist. Turns out he'd essentially broken his neck, the sort of fracture that has one disc being displaced and sort of riding up onto the one above it. He had it corrected by the same guy who takes care of the Cowboys and Mavericks. He dodged a major bullet that day.
Funny how siblings can take vastly different directions in life. My brother (father of the nephew mentioned above) was a multi time World Champion trainer (Western Pleasure) and an AQHA certified judge. He had numerous articles published in a variety of horse journals, did judging and training all over the world.
I get on a horse and I'm baffled - no stick shift, no clutch..... I just don't get how they work.