I was EE and I had burst veins about 3 times. I thought it was to do with expressing but maybe it wasn't?? I was really shocked because when it first happened I looked down at the bottles and saw the milk was pink so I raced to the doctor. I didn't have mastitis so not sure if it is something different with you. When it happened to me it lasted for a couple days slowly going away. My situation of course is different to yours so I'm not sure what to suggest in how to manage it. I guess it was easier to manage this issue whilst EE because I just turned the pump down a bit for a few days but kept on expressing. I had enough supplies that I didn't feed it to DS, but maybe I could of, I'm not sure. I also tried phoning the ABA but the person I spoke to hadn't heard of burst veins before.