The only travel ailment I get is a painful backside, but I have some relatives who get travel sickness. I hear that the best way to curb it is to focus on distant objects in the landscape, and that focusing on objects very close to you like a book, or say, a GBA ( ) usually results in nausea. Another very good remedy is to eat ginger before you set off, but ginger is nasty! Ginger cookies on the other hand...