I'm sorry you were involved in an automobile accident that was not(?) your fault. Be thankful you were wearing pants and underwear at the time or being 'rear-ended' would have really given you something to holler about.
Do you have insurance? Does the other party have automobile insurance? Were the police called? If so, whom do they say is responsible?
Oh yeah. They are called 'accidents' and not 'on purposes' for a reason.