You aren't too far behind me on the new diagnosis front! I've had my lumpectomy and pathology results and now in the process of talking to fertility specialist about preservation before I start chemo in 8 days time.
I am also in Melbourne and happy to email, chat or catch up if you want someone to talk to. There is also a group in here called Melbournites which meet for lunch every so often.
I don't really have much advice just that I have found it easier to break it all down into stages so you don't get overwhelmed. It was too much to try think about all the possible scenarios so better to just save my energy for what is actually happening right now!
It's a pretty crazy experience and think you have it right looking for some meaning/learning from it.
The best quote I have stumbled upon:
You can't change your situation but you can control how you respond to it.
All the best for your results! Let me know if I can help any way. I moved here from New Zealand when I was 18 so I know what it is like to feel homesick and lonely at first.
You will get through this and be stronger for it.