I've been b'feeding for 9 months w/ no real problems, but yesterday I developed a HORRIBLE pain in my left breast. When he latches on, it feels like he's biting the *&^%* out of me. He's not biting, and it still hurts when I relatch him. I'm forcing myself to nurse on that side so I don't get engorged but it HURTS!!!! I can't feel any lumps, tenderness or hardness--any ideas as to what's going on?