At my last job I did the same thing. The job I had before that I got let go because I was missing to much work due to depression. I got another job after a couple of weeks and made in through one day. The next day I sat in the parking lot and had a break down totally overwhelmed with anxiety and started crying. I just couldn't do it. I called my boss and told him I had to quit for mental health reasons. That was a year ago and I have not worked since. My depression has become much worse in recent years compared to all the years I was working.