Hi, Thanks for writing in. It is possible that driving a vehicle is stimulating your inner ear nerve cells and causing a sensation of dizziness or vertigo. This happens when there is a possible condition involving hair cells in inner ear; that get disturbed by sudden change in position as in driving. You need to consult a neurologist and ENT specialist to get evaluated for your balance mechanisms in head and inner ear. Complete clinical examination is required with certain investigations like MRI scan brain and video nystagmography to confirm that your brain is normal and if there is any condition involving the inner ear balance mechanism.