I was described as a failing teacher. I was an easy target after a poor Ofsted (ironically, I was one of only three teachers at the school to not get an RI or inadequate in their lesson) as I was temporary and new. So I was hounded by the Deputy Head. I lost three stone as I physically couldn't eat at school through anxiety - and of course I was at school most of the time trying to be better at my job - an impossible task given the agenda of SLT.
I too, at this point, knew exactly the place on the motorway which I would drive off. It was a nice, high point, and wouldn't inconvenience too many people. After considering this for a few weeks, I gave my head a wobble and went to the doctor.
I am now in a nice school (I had a 'halfway' school where I went in and volunteered, then did supply and built my confidence back up) where all the things I was told I was terrible at are my areas of strength. There are issues in my new school, of course, but at the moment I feel supported and valuable.
The constant data, form filling, initiative following, marking 90+ books a day, exhausting unrealistic and demanding parents, parents who are dangerous (not just physically, but to your mental health too) are very negative flipsides to the positive sides of this job - the public see long holidays, INSETs and 9-3 hours as signs that teachers whinge and have it easy. I agree that there are definite perks - but I would rather forgo long holidays and have less marking / more respect from parents / more accountability on the children.