Hello! Ladies, has anyone had something like this?

Hello! Ladies, has anyone had something like this? Can you tell me...on Monday they operated on my breast, like a purulent mastitis...the doctor said they didn't remove all the pus today, and I understand they were cleaning it again under anesthesia. And the doctor says to express milk...but there's an open wound there...and I can't even imagine...it hurts so much...I try to deal with the pain, but it doesn't work...a breast pump also doesn't help...there's blood in the milk that comes out...what should I do? He says it will be another mastitis if I don't express milk ?????