You should see a neurosurgeon. You may also need an MRI of the cervical spine as this may show slipped discs in the neck are the cause of your pain.
I would call your Dr. and ask those questions or ask him to refer you to a neurosurgeon or a Dr. that can answer your questions. I always said to myself "if this Dr. doesn't know the answers, then I want one that does". GOOD LUCK to you.