Sorry you're having such an awful time right now Amanda, and the breast cancer is the last thing you need to deal with. Big hugs from me.
My Mum had a cancerous lump in her breast nearly 3 years ago and underwent a lumpectomy and radiation, and she's now absolutely fine. Sounds like it has been caught early, like hers was, and although it sucks obviously, it doesn't sound as though there's any reason to be too worried.