I went through something very similar 5 years ago, but with the support of my husband I quit without even another job lined up. I had been at my old job 12 years. It just wasn't going to get better. I am sorry I can't give you more support. By the way, I have a great job now, little stress, and a great boss and coworkers. It did take me 7 months to get my new job, however.