lanolin is a nipple cream. The first 2 weeks are the hardest, I was so bad I bled, so they were beyond sore. Warm washcloths or heating pad after each feeding, and lanolin by lansinoh or any type of nipple balm to give your nipples relief. Your milk is coming in so you may be engorged , and it takes about a week or so to regulate your milk.
are you breastfeeding or drying up your milk? if you are breastfeeding use lanolin, and warm clothes after each feeding. If you are drying out your milk, it will be like this for a few days while you dry out. Use a tight sports bra, and cold cabbage leaves