Hello R.,
I've read all the responses, and I agree that you check your water intake and what you're eating.
However, I also wonder whether your baby is latching on correctly. Is this your first child? I had the same problem with my first child, and I was breastfeeding "like a pro" at the beginning and was SO proud of myself, until...the same thing happened to me. After many tears from both my baby and myself, I hurried to see a lactation consultant, and instantly she realized that my baby wasn't taking "in" ALL the areala, (brown area of breast) into her mouth! When that happens, they are not able to extract as much milk! As a matter of fact, I had noticed that yes, indeed she was only sucking at the nipple, but I didn't care if she did, I thought that the important thing was that she was sucking and drinking! (I thought I was the one being affected by the redness and blistering that was beginning to occur. But it turns out that if not properly latched, not only do YOU suffer, but the child doesn't get milk after a while. The lactation consultant "played and teased" my baby by gently touching and pulling on my baby's upper and lower lips, and when my baby in frustration opened up her mouth wide enough to devour an entire horse,...the consultant quickly,(but gently) shoved her tiny head into my breast! And it was so fast a shove, it actually startled me, but my baby latched on and started sucking like she was starved! haha (Then she unlatched her and kept doing the same trick...to teach the baby that she must open her mouth and take in the entire brown area of the breast, and not only the nipple! Then I cried at the relief and happiness that I felt! I had been up all night, desperately waiting for morning, so I could go to the hospital for this, and it was one of the best days in motherhood that I can recall. Try it... Hope this is all that's the problem and it can be solved. Let me know! Good luck...M. Angeles