Neck pain

Hello,
Here's my story, I'm will 37 in March. When I was 15 I was a passenger in a head on collision. I broke my neck and crushed c1 and c2 in my neck. They couldn't do surgery to put pins in my neck because it was a centimeter from snapping my spinal cord in half. My family was called to hospital to say their goodbyes but by the grace of God I'm still alive. They put a Halo on me and calcium formed. After 3 months they took the Halo off. The doctor's told me that as the years pass that the calcium will eventually go away. I stay with headaches and neck all the time. What should I do?