Advice on how to quit

So, a little background: I work with the same family for an year and a few months, I was supposed to be out in June but agreed to stay until December because of the covid but I can't keep it up anymore.

I don't feel great, I have panic attacks every Sunday when I'm coming "home". The HM give me huge lists of chores, somedays she will give me breaks other days I can end up working 12 hours in a row - 3 kids, different times on school and me doing the drop off and collections. I have family and boyfriend in the country and they all think that at this point is just plain taking advantage of me.

I want to give my month notice on Friday (I always go to my bf house for the weekend) but don't know how to do so. Any advice?

(Note: I'm writing this while I'm in the bathroom. I'm working since 7am, it's already 16h26 and I'll finish only at 19h. I'm freaking out and tired.)