It might be worth looking into Upper cervical adjustments, and possible trigger points in the muscles.. info can be found under
NUCCA, National Upper Cervical Chiropractic Association or Up C Spine

Trigger point info many sites have online some of it you can try yourself..
But it sounds like the upper cervical junction got knocked out of alignment c1 & c2..
It is more of a speciality than general chiro work.. but some general DC's do study it but don't use the X rays and fancy machines..