Breastfeeding TOO MUCH MILK!

Dominique • Thrilled to be expecting our third child in March.
This is my third baby, 1st boy, and I'm producing too much milk. He can't even drain one boob during a feeding. Anyone else experiencing this? I am 6 days postpartum. I have to pump in the mornings so he can latch onto my nipple. Any advice? My previously tiny boobs are like painful boulders!