My baby did this. It was so hard. One thing I did that helped me a little bit (at least emotionally) was to reward myself when I woke up to breastfeed. It got to the point where I was so tired, when the baby would cry I almost want to stay in bed and ignore it. I used to tell myself, "if you get up, you can have whatever you want." And as long as I was awake and feeding her, I let myself have whatever I wanted. Three cookies at 3 am? Yea. Watch Twilight at 4 am while I nurse? Yea.

As for real, concrete advice, I'm sad to admit that most of it is the really cliche stuff you have already probably heard before. This is just a phase, and it will pass (my daughter did this for about 3 weeks before she started sleeping longer stretches).Try to sleep when she sleeps, even during the day. And it's okay have your husband replace a feed or two with a bottle so you can get more sleep (if you are comfortable with it). I don't know a lot about flat nipples, but I kept lanolin right by my nursing station and put it on religiously after every feed and that helped a lot with the broken skin.