I agree with the other two posts about calling the police. As far as I'm concerned, when a car tries to run you off the road, it's attempted vehicular manslaughter (ok- maybe it would be hard to prove, but 2000 lbs vs. 200 lbs seems like attempted murder to me).
Don't feel ashamed. Sometimes our raw human instinct takes control and we say and do things we might not otherwise do when we feel like we're in danger. You were standing up for yourself and trying to protect yourself against a potential threat. I think I would've reacted the same way.

I'm glad you're OK, tho.