Sorry you got a diagnosis. Nobody ever wants or expects to hear that. I remember that dazed feeling where it hasn't really sunk in. It takes some time. You obviously have some good background knowledge and experience that is going to help you through. I hate that waiting time where you don't know everything about your own condition and you fear the worst. You'll be ok though. I had tumours of about that size and bad nodes and I'm on the chemo/radio journey too. It's amazing how many of us there are and we'll be ok. Hang in there and get through the next few weeks. Just take it one day at a time. Tell your family when you're ready. Your sister is going to be a huge support too.
Hugs,
Natasha.