Damn man.
So at this point you're sure it's cancer and not just, say, elevated PSA readings? I remember my dad had a bit of a scare when his PSA reading hit 6 (it's supposed to stay under 4).
My grandfather died of prostate cancer, but his doctor was a quack who didn't warn us even when his PSA readings went above 20. Apparently prostate cancer is easy to treat if caught early.
Best of luck to you!