In all honesty I think I was close to the hospital scenerio. It's actually not from a wound, but from something a girl is supposed to get 5 days a month that actually kept going for four months. Still there but barely. My doc knows, but I was actually curious just in case what they are doing now doesn't work and this is the option they might have to take... though it's still a curious thought.
Though with what Bloodstone first said is a bit comforting. Not only that I was curious.
You won't need any replacement with blood lost from a period as the 'lining' has already built up in your uterus and is gradually lost, you are not losing fresh blood from your system. You can become slightly anaemic after an extremely heavy period but that tends to be the type where it is extremely heavy over a very short period of time.
I bled for over 10 months after the birth of my first baby, no-one knows why, it just happened, I was checked for everything from STD's to retained placenta and nothing was wrong apart from a cyst on my left ovary which wouldn't cause that amount of extended bleeding. I didn't become anaemic or anything, it was just a royal pain in the arse and I suffered no ill effects.