I would have used every bit of strength I had to catch up to them at the next stop light, stop sign, or whatever and give them a piece of my mind (ie pull them out of the car and beat them). It's okay though. Hopefully karma will cause this person's car to swerve off the road, smash into a brick wall, and explode the next time he tries to do something like this. In my opinion, people like this are scum and don't deserve to breathe the same air as the rest of us. That's just my opinion though.

Glad you are okay and I wouldn't sweat it bro. What goes around comes around.