donating 500 ml of blood

a blood donation event was held at my academy,only 1 of my fren n i went to donate.we have to fill up a a application form b4 we can donate.the form consist quest like whether we r sick or got AIDS a not-.- "" . after filling up den the nurse u a weird stuff to poke our finger n drain some of our blood for testing.after that den i proceed to the seat n wait for the nurse to come.the nurse apply some stuff on my hand den i felt something went through into my vein.even thought i am a guy but i still scare of looking at it...^_^ lol...they put a tube into the needle n start draining blood from my right hand so i use my left hand to play hand instead.i keep taking pic of my right handphone instead n i keep sms non stop lor.after 15 min plus den the nurse remove the tube n wrapped my hand with a cloth ..