Some w/TOS often get headaches & migraines.

One cause can be severe spasms and/or trigger points , those can refer pain/symptoms to other areas.
It might be worth trying some self triggerpoint therapy to see if it helps for your symptoms o not.
A tennis ball or any small ball or similar object is what I used on the floor or against a wall to apply pressure.

This clickable chart is very handy -
http://www.pressurepointer.com/pain_reference_chart.htm

our Trigger point information {TrPs} for short - sticky thread -
http://neurotalk.psychcentral.com/thread125577.html