Think about something for a minute: If you don't like the idea of it, and/or you have a problem with needles, etc., think about how you'll feel after you go through it, and know that maybe someone's mother, or child, or husband or wife, is still alive because you gave blood
I've never heard of anyone being hurt or catching anything by donating blood since the 1970s before they knew anything about AIDS and hepatitis and all. It's all brand-new sterilized equipment and disposable gloves, and super-clean where they do it. And they'll check you over to be sure you won't faint, and you're lying on a couch when they do it. And they'll give you plenty to drink, and won't let you hurry out of the place until you're 100% safe. Don't get me wrong; they're not going to lock you up or anything... Just they'll tell you how long to sit there afterwards. Maybe 5 minutes or 20 minutes most.
Charles
Maybe it's a good idea to let them know when you get there that you're anxious, and about any specific anxieties about the process. This would at least give them a clue as to what may help you be calm through the process, rather than surprise problems arising.