I left too.
I had a horrible 2023 - mum seriously ill for many months, then died in the Oct, funeral Nov. She lived 3hrs away from me so it was very difficult. Dad had only died in 2020, so with Covid I didn't feel we'd ever quite got mum sorted. I had her poa, then was (am!) executor. I have two useless siblings (very dramatic sister, absent estranged brother), so I had to manage them as well as well as mum's wider family and friends.
Work was a shit show, with five changes of C level person I reported to in ONE YEAR. My actual line manager was put at risk of redundancy in June (eventually left Feb the following year!), I was told and had to support the process (letters scripts etc) but for some insane reason they told her I didn't know and she never mentioned it. It put me under so much pressure that in the end I spoke to one of our NEDs, who agreed I could be moved off that work. But by then my line manager had found out that I did know because the C suite guy in post at that point was an idiot and lied to her even more, so then I had to deal with her mistrust and emotions.
Meanwhile, I had a leak under the floor in my house and the insurer sent some guys who put all my ground floor furniture into storage, ripped up the floors and skirtings. I had to have all new heating installed - all while I was trying to deal with mum. That was Aug 23, I got the stuff back Mar 24!
There was more.
But it was April 2024 when I realised everything was annoying me, I wanted to cry every time I saw an email appear. I couldn't think straight. I couldn't sleep, couldn't breath some days. No motivation. Getting fat!
I left (Oct eventually). I told them I was semi retiring, which is true. I am lucky I am at that age and financial maturity that I could do that.
But it's taken about 18m to feel OK again. I am still suffering the after effects though - I've never really got my house straight. And I tend to binge shop when I'm miserable so I have too much STUFF!
In terms of what I would do differently - I'd take time off, immediately I felt stressed. It is only a job. I would also seek talking therapies just to offload. Your health is worth more.