It sounds like a tough situation. I am guessing they/you are not in a place where they are too concerned about labour laws or that you dont want to rock the boat about them at least.
I think you know that you need to leave because you are looking for something else and you know your situation is unfair and you aren’t being treated in a way that God made us to be treated, in accordance with our dignity as humans, specifically his children. In other words you are being taken advantage of because you are a nice guy and/or the people you work for are being greedy.
So while you wait for a new job (which is hard to find with working so many hours and being so worn out/stressed ) you can either leave and put the finding of a new job purely in the hands of God whilst unemployed or put up with this position as it is or tell your employers that you will work so many days then you will have a day off etc. giving your conditions and see what they say. If you do the last, they may fire you and you’ll be in square one anyway. I’d suggest you pray on it and ask God his will for you. Put your trust in God. God bless you.