I can't give full blood because I'm anemic and when I SI it gets worse. I can however give platelets when I haven't harmed in a while because they give you all of your red blood cells back. That's the only problem I've heard directly relating to self harm.
I do know a lot of people who can't give blood because of their veins being too small or their blood pressure is too low. I don't have that problem - I'm just deathly afraid of needles.
Oh and don't feel guilty about the transfusion! That's what the blood is there for and I'm sure everyone would rather have you stick around than be out some blood
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