That is called a vasovagal response. It wasn't due to blood loss.

When your vagus nerve gets stimulated, quite often due to some kind of emotional reaction, your blood vessels dilate and your blood pressure drops. "fainting" falls into this category. If you were to check your vital signs during one of these episodes, you'd find your blood pressure would be down, and so would your pulse rate. Blood loss ("hypovolemia") on the other hand, results first in a rapid pulse, then a drop in blood pressure when the elevated pulse rate is no longer able to compensate for the blood loss.

I used to be a paramedic and dealt with this often. And yes, even having been a paramedic for many many years, the sight of my OWN blood in significant quantities makes me vagal out sometimes. "Vagal out" sounds more manly than "feel faint"! <img src="/images/graemlins/blush.gif" alt="" /> If you're sitting when this happens, it's usually easy to make yourself feel much better by bending over and putting your head between your legs. Not TOO far between your legs mind you, lest you generate the wrong impression for bystanders! <img src="/images/graemlins/tongue.gif" alt="" />