Well, it seems obvious that you have damaged a nerve. I would go to see a neurologist about this. In the meantime take B1, perhaps 200 mg the first day, and 100 thereafter. B1 is rather like a food for nerves. I do not know if it will help in your case. But it won't cause any harm.
If you just had the accident, then wait a couple of days. If it was some time since you were hit, see a neurologist.