OMG did this guy DELIBERATELY hit you? If so, I agree, go to the newspapers and tv and tell them the story. If he did it once, he could do it again. I know someone who was also hit deliberately from behind by some idiot who'd been DRINKING!
Consider yourself lucky that you weren't killed or crippled, it could have been a lot worse. As for your bike, hopefully it will be okay as well. I sympathize, about the emergency room. After I was hit by a car 2 years ago I was there 8 hours; and of course, they don't give you anything for pain so you just have to moan and groan. Of course, it's the ones who CAN'T moan and groan who get in. Anyways the whole thing really blows, I hope they get that shmuck.
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You can catch more flies with honey than with vinegar. That's great...if you want to attract vermin.