Sorry about your super rude hubby. Do you have any resources for one of those sympathy bellies? Have him strap on one of those and then leave the kids with him for two hours, along with a list of chores, then see how he reacts.
As far as the 3 trimester exhaustion goes, I've been experiencing that too, but something that has really helped has been doing yoga in the morning. Now, don't get me wrong, I am ordinarily a couch potato with no inclination whatsoever toward physical exertion of any kind, but I suprised myself with how good I felt after doing yoga. Not only did it give me physical energy, but it made me feel content and more centered. An excellent antidote to the pregnancy scatterbrain. My local library had a video called "Postures for Pregnancy" and it features a super cute couple expecting a baby. Its very low key and not too strenuous.