I agree with Sarahsweets, staying for the children often makes things worse for them than better. I often find myself wishing my own parents would have divorced when they were younger (one is alcoholic which is the main reason, although has a few similar ‘qualities’ you describe in your husband).
Would your husband at least support you going to therapy, for yourself, if you think that might help? Or does he just not believe in mental illnesses or think they’re excuses?