Sounds horrible. I can understand that stopping you from cycling, but if you could have managed to sit in a car, would you have been able to drive it? I can imagine that inner ear issues can sometimes affect vision too as my wife suffered from positional vertigo for a while and I could see her eyes flicking rapidly when she was getting dizzy. (I did find a helpful YouTube video about a sequence of positions to put the sufferer through which basically helps to remove the otoliths from the ear canal).