I thought cabbage leaves weren't usually used if you want to keep your milk supply, because they are pretty strong. I think there are less extreme options, like cold showers. (I had no idea of the effect of milk on them!)

As for cracked nipples, I also suggest lanolin (like Lansinoh). It's probably not worth an emergncy lactation consultant, but you could drop by a La Leche League meeting some time to double-check. (And if Junie spits up blood, first check if your nipples are bleeding, because that is the most likely cause. I don't think that causes her to become a vampire.)

Have you joined the breastfeeding LJ community? Also, you should go check out kellymom.com for extra advice.

(And I am giving breastfeeding advice on my phone while breastfeeding. Very odd.)