I had the same sort of attacks, about once a month for almost a year. They are brutual...vomiting and dry heaves for 12 hours....you just want to die.

Turned out to be Meniere's Disease. Looking back I noticed that I had one attack per year after Thanksgiving....which was caused by less salt loss from riding less, and more salt in my diet from eating our salt brined turkey. Then I had the series of attacks after going on a high protein (salty meats) low carb diet for a month.

I had to switch to a low salt diet, and now the vertigo is very rare now , unless I eat salty stuff for a day or two.

http://www.american-hearing.org/diso...ieres-disease/ good luck