Not OP but for me it was declining motivation to even get up leading into complete disability inability to go to work in the morning. I was dragging myself to the shower with my head down, drove to work emotionless and all I could feel was an enormous weight pressing me down. I felt like an empty shell.

In my case it was an absolutely horrible project manager that tried to motivate by competition. Everyone against everyone. And the role i tried to fill was way over my head, but he refused to acknowledge. Some months later I was out for three months and I still struggle after five years. I think this fueled my depression and led to my divorce. I will fight everyone who tries to impose the same amount of stress on any of my colleagues for the rest of my life.

Edit: it’s late, I’m tired and too German for eloquent English. Sorry for the messy rant