I left a 20 year job because I got sick and tired of being sick and tired. Go with your gut. If it's time to go, go. Think of it as an open door to something fabulous that you never even knew. I just started a job that is my perfect match in so many ways. Not saying it was easy but visualize what you want and it will fnd you. Work is such a huge part of life that it only makes sense it should fufill you and not drain you like your current situation seems too. Life is too short to spend tears and stress over work. Best of luck.
Kitten