J.t, your husband's situation is pretty much identical to mine, I was diagnosed back in May, Gleeson 9, T3b, locally advanced. I started on Cypretorone Acetate before having my first Prostap Hormone injection. I had a bit of a reaction that gave me a nasty rash but it cleared after I stopped taking them! My PSA was 54.7 and came down to 1.9 after 8 weeks. I have just started 6 cycles of Chemotherapy after long discussions with the Oncology team. Not pleasant but hopefully it will help make the HT even more effective for the future.
I was and am pretty philosophical about the whole situation although initially the diagnosis hit me like a truck! Same was true for my wife, I think she was even more devastated than me as she has always been the eternal optimist! We have found that talking it through and being honest with each other about what we are thinking and feeling has worked well for us, but then we have always had that kind of relationship so it has been pretty straightforward for us. If you can encourage your OH to talk then I am sure it would help but I know how much of a challenge that can be and some people deal with things in their own ways.
It always sounds easy to say but, try and remain positive, there are so many of us at different stages of the same journey. I have benefitted so much from this site, reading other's experiences and advice, keep coming back and reading, yes, it is information overload at times but, rest assured, as you go down this route it all begins to make more and more sense and becomes much more personal to you and yours!
I wish you all the best for the road ahead.