I haven't had any problem when flying, but then the north east of Brazil doesn't seem to be so turbulent. I do struggle sometimes when I go sailing in rough weather, and I am called upon to go below, out of sight of the horizon for more than a few minutes. I am also unable to read in a car when travelling as a passenger. All these things are related. When travelling in a car, I either sleep or admire the scenery. When sailing and I expect rough weather, I use these:
Detail here :
Stugeron (cinnarizine)
I would expect them to be able to help you.