Get yourself checked out by a Doctor to be on the safe side and to ensure that any underlying problems (whiplash, joint damage....) that may continue for a long time get thought about and considered in any compensation claim. Sometimes it takes a while for the full extent of injuries to show through, I'm not suggesting faking it or trying to cheat the insurers for money, if you are perfectly well then good, but you need to be sure that you have an impartial overview just in case. After a very heavy car accident I ended up paying out near 3 x my total compensation figure in physio, chiropractic etc bills over a long time to get myself healthy and near pain free agin.
Ad for helmets, see earlier link, there is a long running conversation on them but just a quick thought : if you feel that you'll be safer wearing one in the future, go for it, but you're alive and well and clearly thinking and typing straight, after a collision, maybe its not your top priority to be thinking about right now.