RD,
Okay, maybe start including a variety of postures...alternating lying down with the sitting, and maybe this could make a difference?
This is an exercise you can do while lying down, and is great for relieving tension...which is well known for causing headaches. Give it a try and see what you think.:)
www.stress-relief-exercises.com/progressive_muscle_relaxation.htmlKeep up the great work!
S.C.