My mom was just diagnosed recently, in the last 2 weeks. We don't have any known history of breast cancer in our family (hard to tell bc my grandmother on her side was adopted). Finding the right specialist made a world of difference. My mom needed someone compassionate, who would hold her hand and make her laugh. Not just throw scary new information at her in a dead-pan voice.
Find someone who you're comfortable fighting this with, because that shouldn't have to be a focus of yours. If you have questions, let me know. Always willing to talk.