Adding to this, I support your decision to leave the job - I left a job 8 years ago whereby I had a manager who I came to realise wasn’t coping herself in the job and would take it out on me, it impacted on my mental health so negatively I also put my notice in.

It was a stressful time and I can only sympathise with what you’re going through, my experience was that I have never looked back, leaving was without a shadow of a doubt the best move I made. I moved on and got a much better fit of a workplace and no one has ever treated me like that since. Wishing you good luck as you move forward.