For all the nursing and pumping Mommas, I'm pumping and feeding formula until I can get my milk…

For all the nursing and pumping Mommas, I'm pumping and feeding formula until I can get my milk supply up. Anyways, whenever my boobs are full or after pumping, they and my nipples itch so unbelievably bad. Anyone else have this problem?? Or know why it happens or what I can do to help it?