You're right, it is a very tough decision. I've struggled with walking away from work more than once. The first time I decided to leave to raise my kids and then I went back part time. I had my first severe psychotic break down last November and decided to leave again to focus on my mental health. I do miss my work from time to time. I need projects to focus on and challenging problems to solve. I find that I can do that elsewhere if I try hard enough. My mental health was just too important not to walk away. It drives every aspect of my life and I have to make sure I'm doing all I can to control it. Work did not cause my break, but I tend to hyperfocus on it and I was afraid I'd lose myself again if I didn't take a step back.

I agree with BirdDancer. It does sound like you have good options to consider. You are in a tough spot, but also a fortunate one. Volunteering as a mental health advocate would most likely be a very rewarding way to spend your time. I hope you find happiness and less stress no matter what you decide. Blessings.