Do not read while traveling. Do not sit in a seat facing backward. DO not talk to another traveler who is having motion sickness. Avoid strong odors and spicy or greasy foods immediately before and during your travel. Talk to your doctor about medications. Most cases of dizziness and motion sickness are mild and self-treatable. Severe cases and those that become progressively worse deserve the attention of a doctor with specialized skills in diseases of the ear, nose, throat, equilibrium, and neurological systems.
See your Otolaryngologist if you have any concerns.