Motion sickness. Try ginger or peppermint to settle the stomach before the trip. The wristbands that apply pressure to a specific point on the wrist seem to help a lot of people. Natural stimulants, theobromine or mild ephedra extracts may be of help but be cautious with them. Turmeric and galangal are 2 more remedies.
Yes. The only way to stop motion sickness is to stop the motion. However if there is nausea or vomiting with the motion sickness then ginger tea or ginger ale is felt to decrease these symptoms. All prescription and over the counter motion sickness medications suppress the signals going to the brain and thus there is less abnormal sense of motion but this comes with significant drowsiness.