I feel your pain. For a the last 15 years, I suffer from mild attack from vertigo. Most of them knocks me out to nothing more than simply having to close my eyes and sleep it off. Those were the good old days but lately, the attacks are getting more severve.
My last two cases of vertigo actually left me blacked out. The first major attack was about 5 years ago where I was on a vacation and the driver was driving on a winding mountain road. Normally, I will only get motion sickness and that's about the worst of it, but not this time. I got tunnel vision and a second later, everthing around me started spinning right before I blacked out. I was out for 15 minute from what the other passenger told me. I ended up sleeping for 16 hours before I got my balance back.
The second case was my worst case and it happen two years ago. I was at the dentist office and getting a gum surgery in my teeth where they removed some gum from one section of my teeth and transfer it to a more needed area. I was at the dentist chair for 1.5 hours. I felt dizzy when I got up but was good enough to get to the reception area to paid my bill, however I was really feeling sick and dizzy. The dental assistant told me I had to paid $230 of balance and that's when my vertigo took over. One second I was standing there with my checkbook open and then the next second I was blacked out. I was awaken temporary by sound of some voices asking my name and whatever because I simply don't recall everything. Then everything went black again until I woke up in the ER at the hospital with a pain on my head like someone hit me in the head with a bat. I thought I was dreaming that I was at the dentist earlier until I looked at my phone and a reminder was telling me to go to the bank after the dentist. This when whhen I realized the time on my phone showed that I was out for 2 hours. Week later I had to go back to the dentist office and paid my bill and they show me the dent on the wall where I bang my head onto the sheetrock as I fell. That explained the pain I had on the side of my head when I woke up at the ER.
The next three day I ended sleeping at home almost every hour. It was not until the fourth day that I felt strong enough to go back to the hospital for my follow up checkup with my primary. She ended putting this recording thing that had all these wires going from my heart to record it. I had to wear that for 24 hours. I felt like a terroist with a bomd strap on me. Then they did a scan on my ear to make sure no tumor and then check for my hearing loss which did reaveal significant loss at the 1khz range with 70db instead of the normal 5db. Final result showed that I was getting some deposit in my inner ear where the balance and equalibrium take place. These little stuff inside moves around and upset my equalibrium making me dizzy, sick, vomitting and even cases of blacking out.
The only stuff they can prescribe is meclizine hydrocloride which makes me sleepy anyway. They also prescribed some Vallium which helps but not a whole lot. I asked my doctor about my vertigo while driving or cycling and they told me it is less occurance of it happening than it is when I am just sitting or standing motionless in one place. So it was a good to go when it comes down to cycling even with my vertigo problems.