Hi, my 11 year old son had a bicycle accident this last summer and I believe he is now suffering from whiplash.  His neck muscles are severely stiff, like a brick wall around his neck.  He cannot turn his head up nor down or left or right.  He mentions that the back if his skull goes to sleep.   I am concerned about nerve damage.  We have had x-rays done, there is no breakage, the chiropractor at the first five treatments but now it hurts too much to rotate the neck.  Since the doctors cannot see the damage they do not realize what pain he is in. I wonder what to expect for healing.  Or what treatment to provide.
In my opinion you need an MRI to see his cervical discs and his cervical ligaments, avoid going to the chiropractic or physical therapy (until you check C1/2 ligaments and disc, wear a neck brace till unfeeling BACK OF MY HEAD GOING TO SLEEP is not a joke, inability to rotate his head could be actually saving him from more complications please see a good Orthopedic doctor Good Luck