Does getting shocked affect the blood donating process?

I was in physics class and we were experimenting near electrostatic generators (the things were you can get charged and it make your hair stand on end and whatnot). I volunteered to be part of the manacle of people, and got shocked several times as a result. Then I went to move about donate blood, but after they stuck me with the needle, the blood wouldn't flow... Are these two events related, or be it just because I needed a bigger needle size or something?
Answers:
Shock can affect heartbeat, but only when sufficient current flows. These generator (usually Van de Graaff generators) do not produce enough current to affect the heart.

It is possible that either the needle be too small, or they didn't hit the vein properly.

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