If you are carsick, your stomach feels bad because the car is moving. You may feel dizzy, sweaty, or need to throw up. It is the same kind of sickness you can get on a boat (seasick) or on a plane (airsick). Children get it more often than adults, and reading in the car makes it worse for many people. The noun is carsickness. Though actually, people say "I get carsick" even when they have not thrown up yet — the word covers the whole miserable feeling, not only the last moment.

暈車。