I was at a party last night and was wearing knee high boots with about a 7cm heel which are always very comfortable and we were standing on grass which was even better. Around the 2 hour mark I started to feel faint and dizzy so I sat down and recovered pretty quickly within about a minute or so. This happened twice but with no other ill effects. Has anyone had this happen to them?

I suppose I should steer away from wearing heeled shoes if I'm going to be standing for a long time....duuuuh.