OMG lph! I just saw this post. Are you still feeling ok?
I hope so! That sounds very much like the accident my DH had a few years back. He was definitely NOT ok, what with 7 broken bones, a concussion and some internal bleeding. He did not get up and ride off on the rest of his commute. But he was lucky too and is back in the saddle now. So even he was lucky. Sounds like you were luckier. Whew!

I hope you at least got the drivers' name and number, in case you find some damage you didn't notice at the moment. The driver was definitely at fault here, and since there was an accident with possible personal injury, you were strictly speaking supposed to stay there and make a police report. All in all, the driver was incredibly lucky too!