Everyone has given you lots of great advice. My MIL also needs a kick up the arse for doing everything for her sons their whole lives and thinking the sun shone out their butts... if he hadn't had a couple of years living away from home interstate, there's no way our marriage would have lasted this long...
With DS I was lucky enough to have no sickness at all and was able to just rest when I got home from work once dinner etc was done, so for DH it wasn't such an adjustment. This time though, it's a completely different story. I had post 2pm sickness every day which included the throwing up, not just nausea, couldn't stand the sight or smell of meat or cooking veges - that's what made me chuck, together with the tiredness. Plus working and dealing with a very active toddler, and now at the other end of the pg I have serious back ache and fatigue like I never thought possible! I have had to be very clear all the way along what I needed from him - from simple things like dealing with DS at bath time and even more at bedtime (the bigger I've gotten, the harder it is to sit on the bed and read stories etc...) to obvious things like "If you don't want your dinner chucked up into, you need to cook the meat and do it outside on the bbq"...

It's all so different once there's a third little body to think about, even when it's on the inside! It never used to matter that he was oblivious to what needed to be done to help around the house, because you had the time and energy to do those things, work outside the home and keep yourself healthy and sane! Now things are different but he obviously hasn't worked that one out yet. Like the others have said, you need to be very upfront in a non-heated moment so that he knows it's not simply a knee-jerk reaction or a bad mood. I still have to keep reminding myself that DH is not a mind reader, even after being together 15 years and having gone through the pg thing only a couple of years ago.

And when all else fails, blame the MIL... it'll make you feel better temporarily and remind you of the way you don't want your baby to grow up if it's a boy! Good luck! Hope it all works out for you.