I'd try to see a different MHCN, Netix. I am very skeptical at the advice that milk tastes different with mastitis. If you are in pain that will affect how relaxed you are while feeding him and your let down and the ABs can also have an effect on bub's system. All of these things might affect your bfing, so I discount the taste theory. Have you seen a LC at all? You might even find you can still access one at the hospital.

Charlotte - congrats!! Sounds like you're off to a wonderful bfing start.