The vertigo I have been suffering turns out to be due to a condition called Meniere's Disease, or so I'm told...
It has been about 5 weeks since the first "attack" and I have only really been able to do normal activities for the last week, as I was unsure if I would be safe to drive, and to be honest didn't feel like going out for a few weeks there. After the extreme dizziness abated, there was just a constant feeling of "brain fog" and a buzzy feeling, like a swarm of tiny bees in my head. It was hard to concentrate, and every so often I would lurch as if drunk. If you've ever had a bad dose of 'flu, the feeling is similar (minus the sore throat, etc).
No-one can say with Meniere's how soon, if ever, there will be a repeat attack. Apparently some sufferers get them daily, and can't lead a normal life! When I found out about that I freaked out a bit. Sometimes there is too much information on the internet for one's own good!
But so far, knock on wood, I'm feeling much better. I decided to go on a comprehensive multi-vitamin and antioxidant regime, and exercise regularly, and cut out coffee :-( and wine :-( .
Thankfully Mr B was very gracious about being given a 4 week break, and was very nice when I got back on board. The strangest sensation was of not being able to gauge by feeling how fast or slow we were going, so I was unable to work out when and how much to half-halt! Also, going in a circle it felt like my head was still following the curved line even as we went straight ahead.
It has been unpleasant, and rather a setback in our winter training, but *fingers crossed* we're back on track.