So I just donated blood today for the first time. I was fine for a little, I sat down had the water and pretzels they gave me, then walked over to class. After about 45 minutes I felt super dizzy and now I'm feeling pretty bad, really tired and sore and stuff.

I was really hoping donating blood wouldn't be a big deal - I've been worried about it but wanted to help out.

Just feeling like I shouldn't have done it because it's so close to finals. Has anyone done this before, does anyone have advice? I want to be feeling better again