Just a word of caution on massaging the duct - ducts are quite sensitive and you can damage one by pressing too hard. My GP advised fingertip strokes, very gentle, going towards the nipple. You could try putting a heat pack or warm washer on the area before bfing and an ice pack afterwards to help reduce the inflammation as well. Try adjusting your bfing hold when feeding your DD to help clear the blockage. Sometimes using a football hold will work where you normally use a cradle hold.