What gayleggg said, you need to take of you first.
I'm dealing with a somewhat similar decision and that is a great piece of advice that I keep trying to tell myself, too.

I think it's a difficult concept for a lot of us. The concept of taking care of ourselves.

We are not used to telling the people we work for that, while we may try to be good employees, we have our limits. So, please, stop. I have hit my limit. You are crushing me.

Please take care.