C..
You need a real job. not one you can do WHILE you take care of your kids. Yes, you will have to put your kids in daycare or pay for sitters. You are going to need a job where you get benefits - even if their dad is supposed to cover them - don't count on it. The only job you can really do and maintain the "stay at home" status is to watch other kids. That isn't going to earn you enough money to run your own household.
You might think about going back to school while you are still married and have a 2nd income that supports your family. That will make it easier for you to get yourself in a financial position to support yourself and your kids when you decide to end your marriage. There are some certificate programs in healthcare that only take a year.
You need to set up a budget and then figure out how much money you will need to be self-sufficient. Then figure out how to get that kind of job.
I can tell you this.... I earn a *decent* living (not rich, but not making minimum wage) and I have a Master's degree and 1 kid. When I got a divorce I was FLAT BROKE for about 5 years while I dug myself out of legal fees, setting up a residence, extra-curricular fees for her to participate in after school activities while I was working etc. It's expensive. You're tired. Getting a divorce will not solve your problems. It will give you new ones. That's not to say that divorce is not sometimes the only solution, it's just really really difficult.
One additional note: You say "....have to leave my kids alone with their father." You understand that if you leave him when he gets the kids for his parenting time they will be alone not only with him but whoever he brings around? If you look back on previous questions you will see a TON of "when it's my kids' dad's time he leaves them with him mom, girlfriend, aunt....." whoever. You will have NO SAY over that. Just something to think about.