how do I leave my husband when I have no money?

I have three young children & I'm a SAHM. My husband owns a business & has complete control over his finances. I get money each week to go grocery shopping & for gas. I have been doing well using coupons at the grocery store & saving the rest, but I only have $220 saved since October. I have tried talking to my husband about divorce before & it didn't go well. It is not an option for him. I never went to college & I'm truely not smart at all. The only job I would qualify for once I left would probably be something that a high school student would have. Has anyone else ever done this? How would I save enough money for an apartment. My children are used to living a nice life. Would they end up resenting me when I could not provide them with the things they're used to? How would I work and be home to get them off the bus & make dinner? Has anyone ever done this & somehow made it work?
Thank you in advance.