Actually, i'm usually fine after donating blood.
I remember having a training session after donating blood. But aside from the comment of "you're slower today," my coach didn't mention much. Until I told him that I donated blood that day; then he was kind of angry at me.
The main thing probably is the loss of blood. People who are anemic (low iron count) are constantly tired. It is possible that after donating blood, your iron count has gone way down causing you to be tired. But i'm no doctor, so don't take my word on it.
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This part just makes my posts easier to find
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