Thanks for the concern--I'm doing just fine. My back is hurt a little bit, and I had a light concussion, but it could have been a lot worse. Thankfully, right before the guardrail there is a curb with dirt/grass that sort of kept the car from rebounding right off of the rail and shooting across the street.
I realize now that it probably wasn't brilliant hitting the brakes like that... live and learn, I guess.
As for the car, it looks like I'll need a new fender, bumper, headlight, fog lamp, and two new tires. A decent amount of damage. To be honest, it isn't so much the money as it is the fact that I'll have to wait nearly 3 weeks for my car to get fixed. Woof.