I'm also in a similar position to you. Last year was the year of extreme treatments, 6 chemos, 6 RTs, HT injections but later I opted for orchidectomy to get that over with, but of course still suffer from the effects of ultra low testosterone. And that's really the crutch of it for me, instead of the cancer I have to deal with the lack of hormones which in itself is a big change to daily life.
I'm not so active, I try to get in daily walks but lately that's been few, but I work all through the day at my desk. Because I have no doubt I'm living on borrowed time now (I started with 990 PSA with mets in spine, and other bones, but currently down to 0.35) I do feel like I'm in a strange limbo. Some things I wanted to do like learn piano, or a programming language are no longer on my list, instead I just put all my energies into seeing my wife and daughter are doing well (daughter just about to do GCSEs) and planning financially for that.
Daily issues like hands cramping up if I don't move them, shoulder restricting movement through pain, struggling to do anything needing physical strength (getting up after crouching on the floor is a mission) is starting to take its toll on me mentally. My liver is giving me issues ever since it was badly injured from the antagonist drugs I was on last year (10 day hospital stay), and although it's meant to heal itself, recently the LFT readings have risen quite a lot again so not sure what's going on there. I've also put on like 5kg since start of last year.
I wish I lived closer to a Maggies to be able to talk to people more about it, but there are none in Kent unfortunately.
All the above is probably quite different to your experience and I wish you well now that the main treatment is behind you.
Rob