FlyAwayPeter that second post felt like reading my own thread from the future - pretty weird! Thanks for posting.
Those threads are so sad. And I still wonder why it seems always /mostly to be the women who back-pedal on their careers. Which is fine until the marriage breaks down ...
I live somewhere rather more rural & beautiful than Dorset yes, such places exist I love London & big cities generally. In fact, I've lived in London, New York & Sydney. Now I love living in a small regional city with a lot of interesting stuff going on. But I have a fantastic absorbing creative job (academic) and that gives me an international community & local friends.
And also (as you'll read on those threads) I was so panicked by the thought of precisely the sorts of choice & conflict that you're facing - I managed never to marry or reproduce. That was my sacrifice to patriarchy, I suppose.
But I have so much awareness of the ways in which women are socialised always to put others before themselves, and sympathy for women - like you - who find themselves in this difficult position.
Good luck & I think you really really have to talk it through with your DH in very very blunt & potentially bleak terms.
Maybe - play the thought experiment of putting yourself first - what would that look like? What would be so uncofrtable in that pictue that you couldn't bear? What could be managed by buying in help, or asking your DH to take a step back? And so on.
By undertaking this thought experiment, it doesn't mean you have to follow through any of the scenarios. But you would have imagined them, and tested your feelings.