I Had A 4 Wheeler Accident 11 Months Ago. I

I had a 4 wheeler accident 11 months ago. I landed on the back of my neck and head (left side) They did a CT in the ER and found nothing was wrong. But for the past 8 months I have had neck pain that radiates up thru my skull. I can take 2 Tylenol and 2 IB at the same time and it helps for aboutb8 hours but the I have to take more.....what are your suggestions??