How much longer, until the kids are settled?? I, once, felt trapped, by even the timeline of once my kids are in school, full time. That, technically, would have been two months ago.
I like what some of the other's have written here, as ways to bring it up, to your husband. I get the feeling, however, that you may have already tried, the 'talk it out' path?,.
You asked, what to do? Start planning, what you want from your life, with or without him. It's certainly, not an overnight plan.