Hello there,
My sister has the same problem. SO here's what you should do...
If you are a sufferer, there is hope. Keep your body and, in particular, your head as still as possible. It is better to sit in the front of a car, to keep the car window open and perhaps rest your head on a pillow to minimize movement. Do not let the car get too hot, as heat can aggravate the symptoms, and avoid reading, playing computer games or watching videos, which may add to the conflicting signals.
Instead, try to stare at a fixed point above the horizon, not down at the floor. Closing your eyes and sleeping can help. You should also avoid traveling on a full stomach – in particular, fatty and spicy foods won’t help. Make sure you have breaks during your journey. Deep breaths of fresh air will also alleviate the symptoms.
Many people find that they are less likely to feel car sick if they are driving. For some individuals, this may be because the mind is occupied and sensory signals are less likely to be the conflict
Hope this help..Have a nice day!