I donate very regularly. I've never felt anything but fine throughout and after the whole thing. Less than 4% of Canadians donate, and I think that is pretty sad.

The only thing I fear about it is that someone else might feel dizzy enough to v* but it's never happened. The last time I went there was a girl who felt dizzy, and she was laying down and she was SO pale and of course I was watching her to see if she was okay. The nurse noticed her arm was bleeding pretty badly and I think the blood freaked her out because for a moment or two she went even paler, and started swallowing really hard like she was trying not to v*. My heart raced for a moment, but she was fine and I relaxed easy enough once she got up and left. That's the first time that's happened though.