Do you have any other symptoms? Has your doctor ruled out Lyme disease and Multiple Sclerosis? There are lots of causes of dizziness. Good luck in finding out what is causing this Baffling problem. BTW, have you tried mecklazine, a common motion-sickness drug? I get vertigo, and it helps with that. Meclazine is available without a prescription, under several different brand names. Best of luck!