I'm sorry to hear that you were brought down that much that you had to just leave no matter what. I've done the same thing in a previous job and although the lack of income hit, I felt healthier.
I could easily do the same thing now and have been close but I think I'm dealing with the shit a lot more because I can see a way out and am working towards it. Also thinking of the day when I can just send the most glorious of middle fingers when I do leave keeps some sunshine in lol!
Very good point about the jobs boards. I think when you move from job to job via that method, you'll often end up in the same situation as it's more of a case of these job listings simply "being there" and you take whatever. When you find a company that matches with your life values, that is worth exploring for sure :)