Motion sickness is when you feel dizzy or nauseated while riding in the car, a boat, an airplane, a train, or on amusement park rides. Motion sickness is common. The problem is due to an inherited sensitivity of the equilibrium center located in the semicircular canals (inner ear). It is not related to emotional problems.
Lie down and keep a vomiting pan handy. Take only sips of clear fluids until your stomach settles down. If you can go to sleep it will usually help. You probably won't vomit more than once, and all symptoms disappear in about 4 hours.