Hi pungle, know your worried, (been there done that). My prostate Cancer has gone to lymph nodes, spine, ribs, pelvis and a lung gleason 8 psa 1581 stage 4 been on palliative care since February 2016, was still working had to retire to look after my disabled wife she needs 24 /7 care she has Alzheimers, like you i felt OK but kept having sicky do's so plenty of tests, luckily only a hernia one test showed something wrong so had psa, if not for hernia could have been to late. Good luck with your treatment..... Billy 

Hi Pungle, same as you I’m afraid, but only 65.
I got a letter last year from the GP practice inviting me to have a well man check. Turned out I had a PSA of 19. After following a biopsy, bone and CT scan they gave me a gleason of 9 with the cancer spreading out of the prostate into the lymph node. Next week I will have my 5^th of 6 cycles of chemo. I have been generally ok throughout the cycles except for the first one, of which didn’t react too well with my body and I spent 4 days in hospital on an IV drip. After that they adjusted the chemo and 5 days after each cycle, I inject myself with 5ml of Zarzio for 5 days. I am also on hormone therapy and was told it would be for life. I have an injection in my stomach every three months. The fatigue has been a bit a nuisance, but luckily, I work from home and I do this as and when I want to.
All in all, I feel fine and do most of what I want to do. However, it has disrupted my hobby of photography, so instead of landscapes I do portraits and flower macro at home. I and my wife are positive, it is what it is, and we just get on with it. We have a wonderful oncologist who answers all our questions, as she has said there are no silly questions when it comes to cancer. Looking forward to my last chemo cycle though.
Good luck Pungle, I hope it goes well for you.

Thank you both for your replies,it makes me think I can do this after all