Hello Jay Bee,
I saw your Post with reference to the very high PSA, and thought I would share my story of being diagnosed at age 65 with a PSA of 5,006 in November 2013 with very many bone mets and also lymph node mets. I live in California, USA, a couple of hours away from San Francisco.
My initial CT Scans, Bone Scan, and a biopsy of a lymph node all happened within a month. I was in great pain in my lower back and abdomen, in the area of some "mets. I went straight to what we call Androgen Deprivation Therapy (ADT). Back then, I had initial bicalutamide (Casodex) followed by 3 month depot injections of Lupron (may have other names elsewhere) "for life" as systematic treatment. I also had a bone protective agent called Zometa (zoledronic acid), but could have also had an alternative drug Xgeva (denosumab). These may or may not be what is used in your part of the world. Anyway, my pain went away within a month, and my PSA dropped to as low as 1.0 within a few months, and stayed low for nearly 2 years.
If I were treated today, I would have probably had ADT + early Chemo with docetaxel, or ADT + Early Zytiga (abiraterone acetate) & Prednisone, which have been subsequently found to provide longer Overall Survivals than ADT alone for such cases.
Eventually, my PSA started rising again, and I added Xtandi (enzalutamide) when my PSA was back up to 95.0. It again dropped to 1.2, and is currently at 1.9 around 1.5 years on added Xtandi.
All in all, I consider myself fortunate to have had some "lucky biology" and treatments that worked pretty well.
I have survived now for a little over 4.5 years with advanced Stage IV metastatic prostate cancer.
My advice to you is to settle in for the long haul. Keep participating in face-to-face or on-line support groups. Seek the best doctors you can who specialize in advanced prostate cancer. Learn about the CHAARTED, STAMPEDE, and other related Clinical Trials, and the specialists who participated in them. Let go of any "shoulda, woulda, coulda" ruminations about the Past, minimize any fretful anxieties about an unknowable Future that nobody can predict with certainty, and allow yourself to Live Well in the Present Moment. He may not ever be completely Cured of his cancer, but you both can be Healed in many ways in the days, weeks, months, and years ahead.
Good luck and good life to you,
Charles