D.P.
L.,
I can't say I've quit a job that was making me miserable...but just wanted to offer a diferent perspective. I was "downsized" after 20+ years at a good job and let me tell you, things work out for the best. I had already adjusted to a PT salary after the birth of my son. (My choice to go to PT status). Then I was laid off and took a job at half the salary. Guess what? We survived (or should I say 'thrived"!?) Then I was offered my old job back at my previous salary. My point is...life is too short to live it in misery. If you are THAT miserable, I'd leave. You will find something else. You could start sending out feelers now. But personally, I wouldn't stay in a job that caused me physical symptoms for any amount of money.
Another way to look at it is to calculate the savings you would have if you didn't work at all. Would you save on a car payment, child care, etc? Believe me, you can live on a lot less than you might think. Think of other areas where you can SAVE and you may find that (if you wish) you can eliminate O. income completely. Best of luck to you. Be well.