Just wondered if anyone else has or has had this.
Basically it means experiencing dizziness and accompanying balance probs and is caused by the interupption of the flow of the fluid in the ear which acts as a spirit level.
It's more complex than that though, for the eyes and part of the brain are involved as well, and environmental and psycological factors can come into play.
Mine first kicked in about 8 years ago after an ear infection, disappeared within a week.
Returned some 3 years later and forced a job change.
Has been quiet until last couple of weeks when I've done a bit of pavement surfing, but running seems to help! Still very scary and staying on top of any fear is for me what makes it manageable. Worse in the morning as most things are.