I was lurking yesterday and read a post where someone was suffering breast pain. I was unable to find the post today. It sounds as if the op was suffering from a blocked duct. This happened to me, caused by a nursing bra that eas too tight.
I cured it with hot flannels and massage in a downward motion. A plug of dried matter shot out and I had the equivalent of the fountains at Versailles as milk projected into the air!
The relief was tremendous.