I forgot to welcome you to the club within a club (metastatic prostate cancer). 😕

As @jeffmarc mentioned, going to a decent multidisciplinary cancer research centre is critical at this point, because treatments for stage 4 PCa have changed enormously over the past few years, and the word hasn't gotten out to all the smaller practitioners yet.

If treated quickly with the latest best practices, it might become more like a chronic disease than a terminal one, at least for many years, and maybe indefinitely.

There are no guarantees, but we have genuine hope now.
https://www.scientificamerican.com/article/treating-prostate-cancer-at-any-stage/