First off have you thought about going to the hospital? If you had a blow on the head like that which made you feel dizzy you must have had a fair old impact. The hospital can record your injuries so if you catch this scum bag you can put a personal injury claim in against him.

Secondly, get the accident reported within 24hrs. If an injury has occured then they should investigate it. Let them know what route you took as they may look into CCTV to try and capture the reg of the vehicle. Also write down a description of the driver if you can remember.

Hope you get your car and head sorted