I'm on a similar path to you, diagnosed with metastatic PC in August with PSA of 14. PSA now 3.35 after prostap and 2 bouts of chemo.
I'm 4 years older, main problem for me at the moment is irregular sleeping patterns, dog tired at 8pm but wide awake at 4am, driving my poor wife crazy. Think its down to the prednisolone steroids.
My next target is a holiday in March once I've got the 6 Chemotherapy sessions under my belt. Since I got diagnosed I'm classifying this as life number 2, certainly not as much fun as life number one but making the best of it.
Good luck mate.