To answer one or two of your questions - why model railway? Silly really, I was just looking at my small layout whilst thinking of a username!
I am lucky in that I have my eldest daughter living nearby and very supportative. Also my son and a grandson live quite close and visit.
The local health services seem very good. I am due to start pulmonary rehabilitation this month and more lung function tests.
My worst part of the day is getting up. As soon as I move I start getting breathless and remain so until lunchtime, wen things tend to improve. I'm working on my walking, which at the moment amounts to barely 15 yards without needing a rest.
I've recently dug into my savings and bought an HSL riser/recliner armchair. I find this a good - if expensive - investment, particularly being able to quickly lift my legs to a fully restful position.
My main problem is that I'm wearing my dear wife out! And she'e also disabled.