Note down everything you remember in a Word document or in a note pad and anything that comes back to you, absolutly everything, any phone call you make or letter you write from now on keep a record, every police call etc etc. You'll more than likely have to fill in a couple of claim forms and it's much easier to say see attached and attach a print out or copy.
Take a film photograph of any injuries or brusing, plus go and see your doctor. A digital photograph is no use since it is easy to modify images on a computer and make injuries look worse that the really were and digital photographs are not accepted as evidence in UK law. (Apart from that used in Speed cameras? ED)
You won't get much for your injuries if anything at all, but if something comes back in a year to haunt you then you need to be sure that it's all written down now.