I have been carsick since I was a child. It will take three hours by bus recently. How can I avoid carsickness?

According to my carsick experience (I used to feel dizzy in any car except my bike), eating is useless, only sleeping or lying down is the most useful. If you don't want to get carsick, you'd better get on the bus and find a place to lie down. Try to lie flat, close your eyes and listen to music. You'd better go to sleep as soon as possible. Just in case, prepare plastic bags. If you want to avoid carsickness completely, you have to take more buses. I took the bus for 2 hours every day, 1 year passed, and I never fainted again. )