Hugs. You are a good mom and you are doing everything right.
Have you consulted a LC in person? Or what about your doc? It seems odd that a mom in good health who has already established a supply would not respond to all the work you're doing. Maybe check you for a vitamin or hormone imbalance?
Lots of hugs, baby will be just fine. Even 1 ounce of breastmilk is magic.