[IkmoIkmo]

Pretty much the same answer as 'how do I find a job, I'm unemployed'. I'm sure you could answer that question more or less.

Let us know if there's any specifics that make your situation unique.

In any case, I'd make a schedule. For example make a plan to quit in two months. That'll give you some relief as it's something to work towards. Use up any vacation days you've got left. Tell your boss in a month from now you're quitting. And save up every penny the next two months you can to build a bit of a buffer. Try to save up enough to pay rent and food and such for a few months.

And really, start applying for other jobs. When you do tell your boss you're quitting, tell him you disagree with the current workload and that you'll be quitting in 4 weeks unless you can work something out. Perhaps they can propose a middle ground, if not you can leave.

In general do everything you can to not be dependent on your current job, meaning: find alternative jobs + build up some savings.