I moved out last summer (slightly different situation as only one DC still at home who was off to uni in the autumn), and almost instantly I was so much happier. It had all been really rubbish for a long time (no sex for approx 15 years for eg) and it was only when H instigated couples counselling that I suddenly realised that I couldn't do another 30 years being miserable, stressed and depressed, and so I moved three hours way to a city I didn't know. Which was quite a spur of the moment decision, but most definitely the right one for me.
And having spent the past six months thinking through everything, I've come to the conclusion that H was emotionally abusive, but not deliberately (which in some ways makes it worse maybe?) and that I spent so much time walking on eggshells around him, and always thinking of what his opinion on something would be, as if he didn't agree, he'd withdraw emotionally from me (we never really talked things through, and I always avoided the "difficult" conversations as if we had split up when the DC were younger, as a SAHM who'd never really worked, I would have been in a very difficult position, trying to live in a really expensive part of the country, bringing up three DC by myself).
I'm now being framed as the bad guy who refused to put any effort into saving/working on the marriage (as I bailed out after two sessions with the counsellor), but he refuses to accept that I'd been unhappy for years and years which he'd ignored. One DC is pretending it never happened, two DC are happy for me, my family are happy for me, some of his are OK with me, some think I'm mad.
But, when a friend said in the autumn "fuck me, you look 20 years younger!", it spurred me on to do something about my weight and my fitness (and my education), and miraculously I'm no longer stressed depressed and lacking in self confidence/belief.
At the same time though, we run a business together, and that gives me a flexibility with work that I wouldn't get anywhere else (I'm going back to uni via a college course, and need a job which will fit round that, but will also pay me the salary level I need), so I'm having to not rock the boat too much about whether this separation leads to divorce or not, as splitting the business is complicated by the legal percentage of the business I own vs the moral percentage I'm entitled to (because I did all the DC/house stuff, H was able to work as much as he needed to in order to get the business to the level it's currently at, so there's a difficult conversation to have there).