Ah, a big change like that sounds so glorious. I think about that a lot, but I would never do it, because I am too lazy for change!
I would recommend smaller, incremental changes where you are right now. You say that you cannot make "big changes", but I bet you can, just slowly. But always know that the "sell the house, bail, move somewhere cheaper" is ALWAYS going to be an option. I remind myself of that constantly. There are many places in the country where you can buy a house for $100k outright. Always the nuclear option, so to speak.
I've been where you are (overwhelmed), still am in some ways. But we've dialed in MUCH of our finances. A case study might help, as others have mentioned. But first, where is the money going? Where is the time going? I have found too much time spent doing things that do not enrich my life, in more ways than one. I stopped watching TV, almost completely. Instead, I exercise, read, spend time with my 2 kids, cook, meal plan, and attempt to get MUCH more sleep. I feel you on the husband - mine is not exercising (hasn't in 2 years), is super stressed, but has started doing things for enjoyment on the weekends (house projects).
One of the things that I did, several years ago (when my younger son was around 2 or 3), is just say "eff it" at work. Work is not worth long long hours for me. I go to work. I do my best to be efficient. No company, no job has earned my 100% loyalty, more than 40 hours, "110%!" Making the effort to have work be more reasonable, to not "take it home with me" literally and figuratively, has been helpful.
As far as simple living at home, small changes. Meal plan, eat out less, keep the housecleaner, plan family time together (movie night, game night). Go to the beach or the park, reconnect. Sleep. How old is your son? Because if he's under 4, know that you are in the trenches and it DOES get better.