I so understand and sympathise. I don't know where we find the resilience to carry on. Some of the things that help for me are music, sleeping in a different room, having part time carers, trying to make sure I have one night a month away on my own. This has taken me years, literally, to put in place and it never stops. I Might just have found somewhere that will take him for respite occasionally (most care homes not licensed for somebody so young) so that I don't have to depend on ad hoc visits from distant and busy family. Then I have to cope with the guilt. But I have found that with all these that I can then concentrate on having 'quality' time more in the time we are together, which is still most of the time, and the depression is less.
If only the hugs did not have to be virtual xxxx
And I am sorry if my temper showed at the comparison with age-related dementia but it is so very different that comparison should never be made ever, however well-meaning. And of course it helps to have a safe place to say that here when if real life you have to be so damn polite with everybody all the time