Spike, wishing you the best in this struggle mate, and also applaud the bravery of your post. I have my own demons and I understand a lot of what you said there.
I think you're right about the impact of the isolation. That's bound to be a big impact and hopefully something that can be addressed with some changes like moving closer to home as you mentioned being on the cards.
I hope you don't fixate too much about losing passions for hobbies over time, this happens to almost everyone. For example with football for me. And I felt down about it and started to psychoanalyse it. But what I realised with football was that what really made me love it in the first place was that it brought me together with people, and it had stopped doing that, because circumstances changed as I grew older... I went from watching it with my football team at the pub with regularity, and watching it at home in order to talk about the matches at training, and having a girlfriend that liked football more than I did, who watched games with me, whereas now days I left the football team, my wife is apathetic and I don't really have any real life friends I talk football with. This saps alot of the best bits out of it.
Best not too put too much pressure on yourself to feel a certain way, as it can amplify any negative feelings.
Hope you feel better soon mate