I have problems from flying too. I suspect it has something to do with the flux in altitudes and oxygen that my body can't respond to, causing a domino effect. There are devices that can attach to phones that measure oxygen levels in flight. After learning about magnesium lotion, I wonder if it would help by opening vessels during the flight. Maybe breathing exercises may help as well. Just theories so far. I will be trying them out on my next long flight. I have done (mild and short in duration) aerobics after the flights in the past which seemed to help.