Hi M., Your qeustion caught my attention. I'm 25, I've got two kids, ages 2 and 4 (almost), I breastfed both of them. I never used a nipple shield. I really think that you need to trash it. You are not giving your nipples time to adjust to the suckling. A babies saliva is a natural healer. I think that your nipples will continue to be sore, all that they are experiencing is suction, and it must be rough. It will be hard too, once your nipples are introduced to her salvia, they may dry out a little and crack and be sore, but, thats all part of breastfeeding. After a week or two things should get back to normal. Try excreting a little milk after feeding to rub on and around your areola, to help with the dryness. Also, regarding the length of feedings, every baby is different. My daughter would want to be on the boob constanly, but, she wouldnt feed the entire time, she just wanted to feel comforted, that could be with your baby as well, not, that she is still hungry, she just wants to be near you and when you breastfeed, that is how they feel closest to you. Also, my son always wanted feed, or atleast that is what I thought. He would feed forever, and when I took him off he would scream, after many questions to family and friends and trial and error, I concluded that he would get stomach aches and/or gas becasue he would be feeding to much. and when a baby has a tummy ache, they think they want to eat more which just makes it worse for them. Try giving Mylacon drops to her once to see if that eases her screams, or maybe she just wants to be close to you. If that's that case, give her a binky, swadle and hold her close to your bosom like you would if you were feeding. Most babies do feed for long periods. This is just my experience, she could be wanting to be near you, or she could be eating too much and getting belly aches. I know it's hard to take care of yourself with a new baby and also you have a 1 year old, you must have your hands full. If your not eating, rest assured your baby is still getting what she needs from you, your body will take from you to supply her, but, that leaves you malnutritioned and tired. Try to find time for an orange, a glass of milk, toast, something to put in your stomach whenever you get a chance. I hope some of this will help you. Good Luck!