same exact thing happened to me in on vacation in Amsterdam. Only time it's ever happened. I was sitting down and felt hot and sweaty and like my hair was on fire...took off my jacket, still hot. Went towards the door and next thing I remember was waking up and stretching my arms thinking I had just woken up in bed - but I had really passed out for 10 seconds and was on the floor. Composed myself, went for the door again, and bam, just passed out cold. I don't recall eating any cannabis...maybe a tiny bit, can't remember. But was smoking constantly, but not much more than I usually do on a weekend. I hadn't eaten in a 2 days - that was a factor I think. This is interesting stuff. That what the was? A vasco somehting?
EDIT: oh wow here's part of what wiki says "When sufferers pass out, they fall down (unless this is impeded); and when in this position, effective blood flow to the brain is immediately restored, allowing the person to wake up."
So that's what was happening, I'd pass out, on the ground I would get the blood going again and gain consciousness, and when I got up again the blood had a problem once more and I passed out again. And after being on the floor for a few seconds the blood is pumping. Fucking weird man. It doesn't say much else...am I going to die????????????!!!!!!!!!!!!!!! !!!!