My prayers are with you. I know it's so easy to obsess about the negative, but much good comes from focusing on the positive. For what it's worth, my wife had lumps removed from her breast when she was like 22 (before we met) and they were benign. Also, although I don't have breasts, I did have cancer 2 years ago. 4 months of chemotherapy. It wasn't pleasant, but everything turned out fine. In other words, you should have reasons to have hope.
Hope is good thing, maybe the best of things. And no good thing ever dies... (Shawshank Redemption)