Hi S., I know you've gotten a lot of good advice, but I just wanted to add my story. :)
I have 2 sons...when my first was born, he was low birthweight and had a lot of medical problems. He spent a week in the NICU and with all of that, didn't have the energy to nurse. Once he was home, he preferred a bottle (easier for him I guess) so I pumped every meal for about a month...that was ROUGH!! Eventually I just couldn't keep up and switched to formula...I felt HORRIBLE about it at first but got over it. :) He's now a healthy 5-year-old.
With my 2nd, he was a good, healthy weight when he was born, but had latching problems. He would get frustrated so easily if he couldn't latch on right away, and start screaming (he's still like that when he doesn't get his way!!)...and he wasn't latching on properly. I tried to get help with lactation consultants--and it was the same thing. With them there, it would work; at home, it didn't. I felt very inept. I was also cracked and bleeding--NOT fun!! I almost gave up MANY, MANY times! I was so sore I just cried. I did try a nipple shield, and that helped, so did using Lanolin(?) cream or whatever it's called. I also pumped to make sure he was getting food--I remember one time, on 1 side, there was more blood in the bottle than milk I think! (Sorry if I just grossed anyone out!!)
Anyway, I hung in there, and am glad that I did....however...he'll be 2 next month, and now I can't get him to STOP nursing!! I've got him down to pretty much just before bed (and sometimes before nap) and when he wakes up in the morning, but I don't know how to wean him! I never had any of these issues with my first. So, if anyone has weaning advice...I'd love to hear them!
Sorry this is so long-winded! Good luck!! And whatever happens, you love your daughter and you'll both be ok (even if you have to turn to formula).
~S.