B.M.
When I first starting nursing I noticed that my breasts would hurt (shooting pains up and down my breasts) when they were producing milk. It was worse the first month or so and then got to where I barely even noticed it. For the sore nipples, I found that Lansinoh nipple cream really helped. I used it after eat feeding or any time they were feeling dry (for me a pulling stretching feeling). I never had a clogged milk duct, mastitis, or thrush, but those could also be the cause of your pain. Call and talk to you doctor just to rule those out. Hope that helps.