I've been breastfeeding my DD since May and pumping since June. I went back to work a few weeks ago and ever since I started pumping more, my nipples began to get sore. I never thought to switch breastshield sizes, because I'd been using smalls since I started pumping and had been fine. Well...one of my nipples cracked and is oozing and the other is pretty sore. I've started using large (27mm) breastshields and they are the only ones that don't make me want to scream. I have no idea if they are too big. I've looked at pictures online and my nipples are quite different and hard to compare. They don't hurt me though. Well, now when I breastfeed, it hurts so badly, I want to cry. I've been using the Lansinoh Lanolin....any other suggestions? I'm pretty desperate! Thank you!