I have been pumping while working for 2 months now. I usually get 40 ounces per day. I pump 1st thing in the morning, then breastfeed my baby, then pump every 2 hours while at work 7 then breastfeed my baby when I'm home from work. I am having trouble pumping with a double electric "the first years" pump. My breasts are full in the back & nipples sore in the front but nothing comes out. The pump is fine, just my breasts have changed so I started mashing the base of my breast to get more milk to come out & it works, but now my breasts hurt & not much milk comes out on it's own, I have to mash most of it out now. Can you damage your milk ducts this way? What can I do to help?