Betty
My mother and her sister have Meniere's Disease, and their symptoms were severe dizzy spells which lasted 24 hours. In their 80's they have been better. BUT, both have suffered TIA's (small strokes). Have you been checked for STROKE symptoms? Or tumors? Have you been checked for food allergies, or any kind of allergies? If you are suffering worst during PMS, perhaps your HORMONES are all out of whack! IF these doctors aren't finding out what is wrong with you, make appointments to see different kinds of doctors!