Feeling for you.
My experience has been that it is possible to have good quantity and quality of life post MBC diagnosis. When I was diagnosed, at 36yo, I had mets to 75% of my liver, many bones including my spine, pelvis & femur, a spot in my lung and a lesion in my brain. Initial prognosis was 2 weeks - 2 months. That was 6 years and 2 months ago, so maintain your hope! Best of luck with your appointments and make sure to surround yourself with a great medical team who understand your goal is to see your children grow up. Thinking of you.