@kelsiev79,
Get on birth control if you're not already on it. Having a 6th kid under the age of 8 is not going to help you leave.
Because yes, you should leave. Both you and your kids will be far, far better off. But you need a plan. You don't need to answer my questions below online -- rather, you should be asking
yourself those questions.
So start thinking of what needs to be done. Do you/can you work? Are any of your kids special needs/disabled? These things will make a difference in terms of any government assistance you can get.
Do you have family you can go to, even if it's just temporary, and even if it's as far away as a plane ride? Are you a member of any local church or other house of worship which might be able to offer some aid?
Do you have friends or neighbors who can help, even if it's just to take the kids for an afternoon so you can do things like investigate where to get a lawyer or a mediator, or just to open a separate bank account? Spend days like that lining up your ducks, whether it's making phone calls or printing off resumes or Googling shelters.
You can do this.