What could this be?

Allie

I recently decided to stop breastfeeding about a few weeks ago. The first week my boobs were engorged and very painful, as expected. I used cabbage leaves to help stop producing. After about a week and a half, my boobs weren’t full anymore and they didn’t hurt at all but I was still leaking a little. Another week and a half later and now my boobs are SO sore. They aren’t full, and they’re still leaking a little but I have no idea why they’re so sore! It almost feels like what it felt like at the beginning of pregnancy and I took a test and it was negative. I thought maybe it was my period but I don’t usually get sore breasts when my period starts but I’m on the shot birth control and I haven’t had a period since before I was pregnant so that’s highly unlikely. Can someone PLEASE tell me what this is and what I can do to stop this? They hurt so bad