Hello @Dobbo, it is like learning a whole new language isn't it. Lots to take I'm for sure. There is no control really with this process of treatment other than how you react to it all. You got good advice above.
Just take it slow, one day at a time. Put yourself first. Get rest when you need it, exercise a little as it's good for stress and the mind. Eat well. Are you hormone positive as well as her2-negative? I agree with taking someone to your appointments because there is so much to take in and given the initial stress with receiving such a diagnostic our brains can only take so much in.
Reach our here too as everyone is just lovely and supportive. There are no stupid questions at all.
I hope you have some supportive people in your life. Maybe prepare a few meals in advance of surgery. Accept any help offered too. You don't have to be a superwoman now.
Best wishes and take care 🙂 🌻