I donated blood for the first time a few days ago (sat morning, 3 days ago).
I'd given my name in the IISc donors database, A- blood - i'm happy i donated for some emergency reasons.
Along with three other A- donors from IISc - the person needed 4 units of blood urgently.
It was 450ml of it in a bag. I was scared of the needle at first :D But it only hurt while poking, and painless while inside. The blood was oozing out wow nice dark red. Besides I was scared something could happen to me as i am lean and weigh only 61kg while my height is 5 foot 8 inches (or something like that).
Nothing happened! I guess all the cycling gave me good health! I was strong and felt nothing. :) Good - I'm not so weak after all!