Please try to get some help. No job should do this to you. I was in a similar situation a few years back: I had just suffered a miscarriage (I genuinely think brought on by stress), and had been through four years of being bullied at work, and had reached a point where I just felt useless and out of control. I decided it just wasn't worth it, handed in my notice and got a job abroad. Best thing I ever did- I came back a happier and more confident person. Please think about all the alternatives out there. Although it may not seem like it now, the world is a pretty awesome place and there are great opportunities out there.