Good luck to you for being brave. Only you know how much is your absolute limit and when you have reached it. You have to do what is right for your health. However, that said, sometimes we have to do a job that brings in money but that we don't always like.
I hope you won't end up on a park bench because of your inability to cope. Please get some help from somewhere. Be safe and take care. I feel the same but am stuck in my career.