It must be a bug. I've had woozie spells the last two days, and I can only assume it's some version of lurghi, as all I'm doing is sitting here on my sofa, writing. Whilst I'd personally expect to faint if I was, say, on a hot crowded tube train after a long day with no food or water, I wouldn't expect to feel faint sitting on a sofa having eaten breakfast, lunch and lots of fruit inbetween. Ergo, must be some sort of bug.