Fortunately, vision therapy offers an effective way to decrease motion sickness symptoms. Why Motion Sickness Occurs.Some of the common causes of dizziness are: Migraine; Medications; Alcohol; Inner ear problems; A decrease in blood volume; Dehydration; Motion sickness. Our walk-in clinic in San Jose provides typhoid treatment, malaria treatment, and motion sickness prevention to help you stay in top form on your trip. Some symptoms of motion sickness are dizziness, sweating, nausea, vomiting, and generalized discomfort. Take control of the situation. The best way to deal with motion sickness is to prevent it altogether. "Know your limitations and take simple precautions," he said. Dimenhydrinate: An over-the-counter antihistamine that helps with motion sickness. If you visit your doctor, you may be prescribed a vestibular suppressant, such as meclizine, lorazepam, or diazepam to reduce motion sickness or nausea.