well, I would get it checked out by your doctor just for the added perspective/information. 3 weeks is a long time for a deep pain not to progress into something else. if you think it may be a lingering blocked duct or absess try homeopathy - it was incredibly useful to me with bouts of mastitis/duct stuff, once I started using it all my breast issues cleared up. I just referenced some homeopathy for midwifery book I found at the health food store, but I'm sure you could find some matches online. Massage where it hurts too, 'hurting it back' always seems to get the energy flowing to clear up problems.