Pat used to get migraines and we found out that he was allergic to some foods. Liverwurst triggered them somwhat fierce and something (not sure what) at El Torrito restaurants. Those things were easy to avoid, but he would still get them on occasion. Then he got Bell's Palsy - which was scary - but it must have kicked the headaches into submission. (knock on wood)
I would like to join those who suggest to go a different route than this particular Dr.