You must realize that it is not going to be easy for you. But I would probably do exaxtly as you want to do.
Yes, cabbage leaves need to be chilled and worn in your bra with holes for your nipples. It is also known that sage is supressing your milk production. They say that even if you eat turkey with stuffing which contains sage and it often does, it can affect your supply.
I also want to send you hugs. I know from my own experience what it means to battle cancer. Having to care for children while doing that must be really tough. You will need a lot of strength, and I want you to feel welcome to come here for help.
BTW, until recently I was your neighbor, I lived in Allen, TX.
<<<HUGS>>>