No, your milk is not dwindling. It just doesn't work that way. You are doing an awesome and amazing job at breastfeeding. (Lactation cookies taste great but the news is they do diddly squat for your supply.) Milk doesn't just "dry up" it doesn't "go away" - you feed and you make milk. Babies, on the other hand, do change. They start being interested in the world around them. The mastitis is a clue - your breast is full and won't drain. It's blocked. Baby has to work at it. When breast remains full it tells your body to ease up on making milk - but your baby knows what to do - feed frequently and in a few short days your supply will be back to normal. Stick with it.