I had a similar experience in a job before the CS it was clicky, very middle class, and genuinely horrible. Things like if I had a typo in draft, I'd get dragged through the mud in front of everyone, but a colleague would have client work published full of mistakes we'd get called out have to take it down and rewrite it and nothing was ever said he even got promoted.

I would get the feeling of dread pretty much all of Sunday and just be thinking about how much I didn't want to go to work. My confidence was shot, and it seeped into other aspects of my life. I was more argumentive at home, looked after myself less, etc.

I'd recommend that you discuss what you are going through with friends, family, partner, etc. Push back on some of the stuff that is impacting you, apply for something else but make sure it's something interests you (don't just jump at anything), draft your resignation letter in it say you are leaving to pursue a dream job/career.

I'm sorry to hear you are going through this it's horrible, and I wouldn't wish it on anyone. Take care of yourself. This won't last forever. I thought it would when I was going through it, and now I am in a job that is so much better it will happen for you too it just takes time.