I ve had vertigo off and on for 30 years, but it has become severe in the last 3 years - daily episodes from very mild to very severe and debilitating. Within the last month, I am now unable to lay in a bed to sleep at night because the vertigo is so severe when I lay down. When it began occuring every day 3 years ago, I also could not tip my head backwards or look up at anything. I am on the lowest dose of thyroid meds and have been for about 15 years. Is there a connection between vertigo and the thyroid and, if so, how can I find out what to do to see if there is a way to help and even eliminate the vertigo? We also became vegan 5 years ago, but I take a B-12 supplement every day, so I m also wondering if there is a connection to that. Thanks.