dahlia - I think our babes are maybe a day apart, right? Mine is 2 1/2 weeks as well, and she is totally doing the same thing, eating CONSTANTLY. She's also still always falling asleep when she nurses on that first boob, and it's really hard to get her going on the second. I wish I had a suggestion for you, I don't - but I feel your pain. :P
Still chugging along here - Norah has latched a few times without the shield, yay! However, if she's really hungry, she rages too much to settle down, so I have to use the shield at those times. I'm still pumping every 2-3 hours or right after she nurses to be sure my supply doesn't tank as recommended by the LCs, and it's working well. She's just eating so, so much today that I can't keep up boobwise and I'm both giving bottles and nursing.
I decided the other day that I really don't have a problem with this situation anymore - she would be taking bottles soon enough anyway when I go back to school, and her latch is actually really good - I don't get any nipple pain at all and she's stopped biting down. Plus, it lets my husband share in nighttime duties, and it's really helping - and he admitted the other day that he likes being able to feed her as well. And as long as I nurse for at least half the feeds every day, I'm having no trouble pumping and I've got a nice fridge stash building.
My goal is to get her exclusively nursing without the shield before 3 months of age to be sure I don't have a big drop in supply - I can probably just start pumping occasionally then. I think we can do it!