While donating blood today as a first time donor, i started to get dizzy, lightheaded and was sweating (cold sweat) at the 7 minute mark-they took my blood for 9 minutes. Afterwards, I got juice and cookies and after resting for 10 minutes had to head to my class. After 10 minutes in class, I started feeling dizzy and was sweating again and felt like I was going to pass out. I do want to donate blood again later on, but how do I prevent this from happening again? Is it even normal that this happened to me? (everyone else was acting normal--no sweating/dizziness)
Thank you