Dizzy after donating blood...yesterday?

Hi, I experienced the exact same thing. I gave blood and didn't feel 100% for at least a week after. It really does take a toll on your body. I would say that you will be fine, your body just needs to recuperate. However, if you really are feeling bad or just want some peace of mind I would go to the doctor and just get checked up by them. Well done on doing a great thing!