My dear friend Jason had terrible migraines starting at age 8. He would wake up with them and by 7:30 or so be vomiting. By 9 or so he would feel better and be outside playing. After a year of doctoring with little relief his parents took him to a chiropractor. After adjusting his back he asked was to see Jason's teeth. After looking he said you grind your teeth in your sleep that is the cause of the migraines. He recommended sleeping with an athletic mouth guard. Jason chewed through it on the first night!!! They bought a better one like boxers use and it pretty much ended the migraines. I think it was being caused by childhood stress. I believe meditation breathing before bed may have helped. My heart goes out to you and your son!!!! Eddie