I feel like I was in a similar position 20 years ago, except that it was my second child. I had gone through dotcom boom/bust and the job market was terrible. I had given all my working moments to the company I was working for, and my skill set was unmarketable, and I was emotionally spent, and my self confidence was void.
I ended up leaving the company and taking a sizable pay cut to do so. It was hard, super hard. The company I moved to was in chaos, we absorbed a bunch of new debt to keep up with things.
20 years later, I am so grateful I made this move. Not because things turned out great (which they did), but because I learned how to say no, and set boundaries for myself and how I let companies treat me.
Keep your head up, and focus on the stuff that really matters.