Interesting. I am and old guy psychologist who was staff on a headache clinic in Indiana years ago (1974), using the original migraine biofeedback protocol from the Menninger Foundation. I got involved originally because I had a spouse with familial hemiplegic migraine and daughters with childhood migraine and eventually classic migraine. None of them became chronic, thank heavens.
We found that the temperature biofeedback protocol worked pretty well for a specific group of patients - cold hands, low blood pressure, strong weather triggers and high stress responses. It took a long period of training and practice, as well as diet restrictions, detoxing the environment, special management of hormones and stress - but it was effective in reducing migraine frequency, often to several big ones a year. Then the triptans arrived and few patients wanted to invest the time and money in biofeedback when the pills or self-injection was so effective.
I recently worked for the Army and did a lot of Neurofeedback with soldiers with what the Army called "migraine" but were typically post-concussion vascular headaches after being hit by a blast (IED). They also had memory & cognitive slowing. The symptoms looked very much like common migraine in triggers, onset, course and response to triptans and anticonvulsants (Topomax) but starting after deployment and usually involving the whole head. These responded very well to Neurofeedback aimed at quieting the brain bilaterally. I was hoping to find some fellow practitioners who can comment further or off-line. Now that I have retired, I want to follow up on this process with Veterans.