utmost sympathy but dig your heels in and wait for facts;
27 PSA is not that high (half of mine last may) but Gleason 4/5 isn't great news, yet again it isn't the worst. I'm still here!
Now you need the scans (takes several weeks, but meantime he'll be given hormone tablets which ALWAYS work)
Best practical advice is what you read here from other posts, and in addition, keep notes & dates of each event, treatment, blood result and what the consultants suggest. Get a handle on what is being told to you. I was really confused especially at first, thank goodness family members elected to come with me to consultations. The patient will never remember everything accurately.
The nurses are terrific, there are loads of help lines, and don't forget the GP can explain stuff later on when you are collecting thoughts.
If you get an offer to go onto clinical trials, grab it; I got extra treatments as a result and the glowing thought that, whatever happens to me, I have advanced knowledge and the fight against diseases: it gives me purpose.
You'll have to adjust life a lot, but there's nothing that can't be worked around. Above all, talk about it, post on here (wish I'd found this earlier), do not bottle things up, and remember the best nurses in the World are right next to you for support.
My hope is with you every step.