Have you done any research about a yeast infection in your breasts/nipples? I am currently dealing w/this problem right now and it is causing shooting pains in my right breast and extremely red/scaly nipples. I am taking Diflucan, which is an antifungal medication for it and just thought it was a possibility if you hadn't already looked into it. Here is some info about some of the symptoms:
Mothers describe the classic symptoms of breast yeast in various ways: severe pain without nipple trauma; sharp, shooting pains radiating from nipples that may extend to the chest wall or back; nipples that may be red, flaky, itchy, shiny, or burning (these are all relative signs, so consider what is normal for you); small, white, hard blisters on the nipple (this may also be due to a blocked duct); and sometimes white fuzzy patches in the folds of the nipple.