I'm afraid to try because I don't do well around blood... well... it's not so much not doing well around blood, it's more thinking about needles poking an things cutting...
I work in a lab, one night in January I had a piece of equipment fail, shattering a glass tube in my hand. Luckly, I came away with only 1 really bad cut, but it required stitches. When I was first getting it wrapped up, I had to sit down because there were like... flashbacks and near halucinations of the shard of glass flying right into my hand over and over.
Then I was fine for a couple of hours when I went to the emergency room and got the info and stuff taken care of. But the second one of the nurses started cleaning it so I could get stitched, same thing. Maybe I'm just f'ed in the head or have a crazy-ass imagination, but the nurse had to open up the wound to clean it, and once the blood started up again, the same mindfvck of seeing the glass puncturing my skin started...
From there... uhh... I'm told I went pale, was sweating in an air-conditioned room, and was mostly coherant... I think they said that I was actually in full-blown shock... they had to give me half an hour before they could pump my hand full of lidocane and stitch it. I tried to hold on as long as I could, but yeah, tunnelvision... it was like someone was taking the contrast slider all the way up in Photoshop or something. Voices shounded distant but clear. The only way I made it through that is closing my eyes and listening to Conan on the TV next to me.
I didn't feel a lick of pain the entire time... in fact, it didn't hurt at all until the stitches came out a week later. Once I was wrapped up I never got woozy or anything again.
So yeah. I wish I could give blood, and I want to... but I don't know if I can go the distance and fill a bag... can they keep going if you go out on them?