Really sorry to hear this Eddie. I fought the big C 17 years ago for the other male disease.
It was tough both physically and mentally. The uncertainty as the start, the endless tests and treatments makes it all feel like a whirlwind for a few months.
Even though not curable, I do see that stage 3 prostate cancer has an excellent prognosis. My dad has it and just lives with it. He has been living with it for years and years and they have told him that old age is likely to get him first.
All my best.