I only had it once badly and I had to have 2 courses of AB as well. Feeding was excruciating - tears, swearing, biting down on a towel while DH helped hold the baby to my breast in case I let her go or passed out from the pain. It was that bad for about 4 days but thankfully only on the one side. I would say it took almost 3 weeks for the breast to be painfree though and it was never the same again. I would get pain when I was quite engorged.

I am so sorry you are going through this, it's an awful thing. Hope you feel better soon.