You sound pretty switched on, Okyep. Put this into your brain on repeat "his hobby, his responsibility". Each time you go to bundle his kit into the wash to have it ready for the next time he wants it, stop and say that to yourself.
I get that you can see your children growing up and leaving the nest, and that you are worried about what that will mean for your life with only dh around - or rather not around much. So I have a suggestion.
If you were to start studying something you're interested in, that could give you somethingto distract yourself from doing his washing, in the first place!
Iknow you work ft, but if you were to pursue something simply out of interest, not because it furthered your careeror made you more employable or something, but purely because you like it, that is relaxing and also absorbing. If you had classes once a week, or a tutorialonce a month, you would meet people who were also interested and that would widen your social circle. You might even find that you're happy to go for drinks after a class, and maybe meet up with a couple of people for coffee before class etc.
An example: it used to be that a lot of the smaller choirs in London were run as evening classes; I made many lifelong friends that way. A couple of the choirs I sang in would regularly perform in the Albert Hall, Westminster Abbey, all over the Uk and Europe. This was 30-40 years ago, though and Idon't know if Local Authorities still fund that sortofclass (probably not) and you may not be interested in Church music either
but you get the idea.
Regardless of how happy with you are with your career, classes and studying can lead to all sorts of opportunities to challenge yourself and to enjoy yourself, and are a good way to meet other people too.
Studying something or doing something, just for the sake of it is very relaxing and a good adjunct to work and family. Your dh knows this and has allowed it to take priority because he's forgott en that it's meant to be leisure, and leisure becomes nothing without the other things around it. You wouldn't do that.