Well I was T3 Gleason 4+5 and 11 out 11 of my cores were positive. I was N0 M0. PSA 25. So not quite as bad as your other half. Five years later my PSA is 0.1 and no sign of cancer (I am too cautious to say I'm cured).
You will find plenty of others on here who are doing as well as I am. You will also find a few who's primary treatment failed but then they had successful salvage treatment, and also people where treatment has failed, but they are still here a decade or so later.
So obviously a cancer diagnosis is not good news but it is probably nowhere near as bad as your imagination is taking you at the moment. Once you have the full diagnosis and a treatment plan things will be a lot better for you.