You don't. You have the right to feel all the fear that you are feeling. We all get that. I spent many nights without sleep (and sometimes still do) and shed many tears at the beginning and even some days now 14 months on. Waiting for results is the hardest part. Soon you will have a treatment plan and know what you are dealing with but it's okay not to just "stay positive". You will eventually draw on strength you never knew you had to get through this, but for me it came after I shed many tears and fears and basically was emotionally exhausted. I did find doing a quick mindfulness technique the morning prior results and prior chemo helped calm me enough to get through.
I am sorry you have had to join us. Do know we are here for you to vent when you need and answer anything you want to ask. It can be helpful to have people outside your family circle to speak with.
Have you a breast Care Nurse? They can really help supporting you through this.
Most public hospitals have one attached but if in country areas they are McGrath breast care nurses.
https://www.mcgrathfoundation.com.au/OurMission/OurNurses/FindANurse.aspxHave you ordered a My journey kit yet?
https://www.bcna.org.au/resources/my-journey-kit/Cancer council also has a counselling helpline which can be invaluable and might help fet you through.
http://www.cancer.org.au/about-cancer/patient-support/131120.htmlTake Care. Kath x