Right. Firstly. You said the driver was not of age. How old was he? (ish). Also what details did you get from him?
You need his name and most importantly his registration number. With this you can make a personal injury. This is if the statement is signed by him and his real name, ideally you would want a witness name too. But you havent mentioned anyone. Also, as you said he was not of age I can only guess he had no insurance. Well, it will go through the M.I.B. (and no its not Men in Black, lol). Its called the Motor Insurance Bureau.
If you are still feeling from your injury then definately claim.
Being absent from work and not going to the doctor doesnt go against you having a claim either. You went to the hospital, which is ok. As they would have written reports anyway which is what the solicitor would be intrerested in.
Happy to help. Any questions. Just ask. :-)