It's been said allready - but also based on hands-on experience
Call your insurance agency and the police NOW! - Don't hesitate - things like this can actually backfire!
Get a doctor to give you an extensive exam - some injuries can show over time. By doing this now, you can prove it's caused by the accident -> Insurance coverage.
I'm shure you got the message, but MD and insurance angency ASAP
PS. Good luck, and have a fast recovery