What point..

So I don't want to come off as selfish but I give blood every two months and that drops my iron levels really low so I'm taking 85mgs of iron and I think its what is making me so sick like I'm giving the gift if life but that what cost ya know? Like where do I draw the line? Between others and my own health I'm just so sick and I'm tired if not feeling well I just want to cry because its so uncomfortable and I hurt