What to expect with metastatic breast cancer and upcoming mastectomy?

Hello, my name is RoBERTa, and I was diagnosed in February. 3,2025. I have metastatic breast cancer that went to my liver. Before this, I was a healthy dietition and nutritionist working long hours every day.I love my life. Then, on February 3rd I woke up and I had a pain underneath my arm. I felt it.There was a huge bump. A few days later, I went and got a pet scan, and this is where I am. I am having a mastectomy, on.May 6 2026.