i have found, that head aches are due to "pressure" in the head, stagnat.
doing proper spinal breathing, focuse on the down, for! people doing spinal breathing, but getting head aches, are moving energy up, but not bringing it down sufficiantly.
ALso, and ill put this in another form, spinal breathing seems diffucult, if their is no present form of pressure, its like blowing air, with no ballon to be moves by it. wispy,