Quality Physical Therapy?
Quality Chiropractic
Or Upper Cervical care? - It doesn't take much to cause a misalignment in the C1 C2.
Trigger points ? - I posted some info for another TBI/PCS member in a recent thread.
*A tight muscle with trigger points in it cannot be stretched out/resolved until the trigger points are resolved..*

There are good care providers and not so good, sometimes it takes awhile to find the really good ones..

I assume you tried different pillows and such..