You might have broke your tailbone. If that's the case, get set for several months of pain while it slooooooooooowly heals.
I nailed mine once. It sucked so bad I went out and got myself some Demon Hard-tail crash pants. I'd have paid 5 times what they were charging to spare myself the pain of another tailbone break. As it is, they've saved my ass (literally) several times over. I never board without them.
"Never attribute to malice that which can be adequately explained by stupidity."
10/11 - 24, Smote on Feb 13