My thoughts and well-wishes are with you.
There are excellent resources available to help cancer and in particular BC patients in navigating the emotional, physical, intellectual and economic decisions and impacts; The American Cancer Society is one example.
In the last few years there have been significant improvements in the treatment of BC; including, Breakthru medications. You, your loved ones and your clinical care team will determine what is best for you, period. And, for the inevitable times when one (or their loved ones) needs a comforting shoulder to lean upon, many non-profit groups offer anonymous 24*7*365 'hot lines' where one can simply be "listened to" or ask questions of others who share similar diagnoses/history. From experience, these resources are in one word, invaluable.
As others have shared their personal stories, so too will I. My DW was dx about ten years ago with BC. She chose double mastectomy vs. less invasive procedures to hopefully improve her odds of long-term survival and quality of life. I know she has no regrets about the treatments she chose - she never second guessed her decisions (genetic testing was important to us, as we have daughters). I am immensely proud my DW's courage, resiliency and, determination to NEVER allow BC to define who she is.
If friends, neighbors and/or relatives offer assistance with meals, shopping, transportation and/or cleaning, I recommend accepting such offers as these are true signs of endearment.
Please accept a virtual hug.
Fargo