I'm terribly sorry, that this is happening.
If, you have a Breast Care nurse, I'm sure she could advise.
I never had one. You said you are from a regional area, you may not have one.
Whoever is giving you the results, tomorrow, may have advise.
There used to be drugs for suppressing milk, but I'm not sure what current medical advice is on that.
Probably a firm bra, preferably without wires. Panadol as needed. Reduce feeding/stimulation to the breasts. There is a sub-group here for young women, who may have more/better advice.
Are you sure it is beast cancer without knowing the biopsy results?.
Good luck tomorrow. Write down questions as has been suggested.
Your mind can go blank under stress. A second pair of ears is great too.