Mrs Mania,
I have the opposite problem...stay in dead end jobs that I positively hate for way too long. This one....seven years and I am treated really poorly by my boss and now even my co-workers. The one before that? 17 years.
But the pattern is similar. I start out 'okay' and end up being in a situation where I can barely seem to drive into the parking lot, have major anxiety and it is hard to make it through the day. Each day is a monumental struggle and by the end of the week, I'm simply amazed that I accomplished - making it through another week.
I hate my job and it has become a preoccupation, not an occupation.