I've given a bunch of blood--every 8 weeks since 9/15/01. Takes a national tragedy to get me over my fear of needles! I've never fainted or puked, though I have felt a bit "light" when I first got up off the table. And I'm always pretty wiped out by the end of the day, after I've given blood.
I've seen people go down, though. I watched a girl get up off the table, and head straight to the ladies room. She made it about half way.... A nurse had a pillow under her head before she even hit the floor--those of us still on tables were applauding, yelling "Good catch!"
Seriously, it's probably a hydration issue, as you said. I always try to drink five or six extra glasses of water in the 12 hours before I give.
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