Lizzie, although I don't know you other than reading your inspiring posts, rest assured that you are in my prayers, as well as many other WGT members.
As I was reading your post, got more than a little misty at your current situation. It brought memories flooding back from 14 years ago when I was diagnosed with prostate cancer. Luckily I opted for a radical prostatectomy and am still here today alive and kicking. Then a little over a year ago my dear lady was struck down with some nasty things and is now permanently in a wheelchair in a long term care home for the rest of her life. As you said, be at peace with yourself.
Only one thing left to say " Let go and let God ".