Struggling to come to terms with diagnosis breast cancer

I have triple negative ILBC breast cancer, localised to breast and axillary nodes. Started chemo 5 days ago. Am really struggling to catch up. Even typing that done is hard. Was all very dramatic presentation. I have been told majority respond to the treatment but it's an aggressive type. I have 3 teenage girls, full time job that i love (albeit a bit too much sometimes), supportive husband, friends - am blessed. I am medical so my mind is doing additional somersaults. How do people manage? Not sure what i am looking for. Hope? Support? I feel I need to maintain composure for family. But am scared, untethered from my usual life. Not looking at stats.