A.,
If every woman in America who didn't get enough help with the house and the kids filed for divorce, there'd be about 4 married couples left!! Seriously, there are other ways to work this out.
Counseling is probably a good starting point. Someone who can act as an impartial mediator could realy help you two work out a reasonable division of labor within your house that takes into account work schedules, time with the kids, etc. It's something that has to be negotiated in good faith, though. If you both are willing to go in with open hearts and open minds, to truly build a system that is fair, and then each hold up your end of the deal, then it can work.
Have you ever talked to your husband about why he is the way he is? Not why didn't he empty the dishwasher tonight, but why does he feel that the burden of all of these responsibilities should fall on you. A lot of people go into relationships with very different expectations of how things will run, because it doesn't get discussed and negotiated in the beginning. You're thinking that you work part time, shuttle him back and forth, and take care of two special needs kids and run a household. He's thinking that he holds down a full time job, provides the main financial support for the family, and pitches in by letting you get some extra sleep when he can. In his eyes, your job is probably the at home stuff, with a couple of hours at a part time job for some extra cash. Depending on where you stand, things can look really different, and what seems fair looks different. You have to both really look hard at your own schedules and each other's to realize how to break things up fairly, so that you each get some down time, and you can get some family time all together.