Every time after I pump lately I've been having this awful pain in my right breast on the back right side of it. It's…

Every time after I pump lately I've been having this awful pain in my right breast on the back right side of it. It's not a clogged milk duct because I've had that before and it doesn't feel the same. I want to say it's the emptiness from pumping. The only way to help the pain is to lay on my breast and take Tylenol but sometimes that doesn't even help. Does anyone know what this could be? It's starting to get worse