I nursed and pumped for my other 4 girls, but with my last daughter, I pumped exclusively. My advice to you is: Get a better pump. Get one with both speed and strength controls. You may be pumping lazily (with all due respect) and it confuses your breasts. It's kind of like when the baby nurses just enough to fall asleep. Pumps nowadays are equipped to empty your breasts. You may have to spend at least $150, but don't think you have to go out and get the most expensive one. Also, don't watch the clock. Pump until you're empty, both breasts at the same time, and while relaxing. You'll have to do this a few times, but then you should be able to switch back and forth or at least nurse comfortably. Good luck! Remember: You're doing the best thing for your baby, and your body knows how to do this.