Hi Bluesky I have suffered from VV episodes for many years. Basically it is a posh word for a faint but fortunately I generally get warning.
It has been described to me as, that for some unknown reason, my BP suddenly drops. Once I get the 'wave' warning I know that if I don't go to the ground, the ground will come to me!
It is a bit of a pain, but it is 'liveable with' so please don't worry at least until your investigations are complete. I see that you are on medication for high BP. It could be something as simple as the medication may be lowering your BP too much?
I am NOT a medic so please don't take this as official - but my experience is that, if I can, I prevent actually passing out, by going to the floor and raising my feet onto a chair or something. The blood then returns to my head. If I leave it too late and I pass out, all I need is someone to check I am breathing (and have a pulse!) and raise my feet as before. I 'come round' after a few minutes.
After each episode I usually feel a bit washed out for 24hrs but then I am fine again.
It is a good idea to let your work colleagues (and anyone around you) know that it may happen so that they don't panic. I may have several episodes in a short period of time, or I can go for 2 years or more, so the chances of them witnessing an episode is not high.
A friend of mine knew it was a possibility, then one day it happened in front of her. She has since told me that although it was a bit frightening when it happened she was glad she knew and that all would be ok.
The real nuisance is not knowing if, or when, it will happen so, as I had small children when they first started happening, I bought an SOS talisman bracelet and put the details of my GP, contacts etc. into it. I still wear it!
I also carry smelling salts in my handbag - just in case!
Good luck and please don't worry - my feeling is - never worry until you know there is something to worry about!