I don't think now is the time for a serious talk about marriage and suchlike because I think both of you are running on empty and that is not the best time to be making decisions.
rmm, it sounds to me as if you are both trying to fit 36 hours into 24 hour days. I know where you are coming from. My husband and I both have 'proper' careers in the city and have a 4YO and a DD who turns 2 next week, and I have been doing a masters on top of my full time job as well, and he has been dealing with his mum's estate because she died unexpectedly last year, and I had PND which only lifted about 6 months ago, and my parents have asked me to try to help my brothers' business which is about to go bankrupt because of the credit crunch and my new au pair is homesick and I need to sort out her social life, and so on and so on and so on. I really really do know what it is like.
BUT confronting your husband and telling him it isn't fair and you need some attention won't make those extra hours fall out of the sky. It will just transfer the stress to him and I don't think it will change anything. In his eyes he has the responsibility for makign the business a sucess for all of you and just as he isn't giving you the support you need, perhaps he feels you aren't supporting him.
I think the best thing you can do is to
(1) Batten down the hatches. Forget birthday parties and forget social lives - the friends who matter will still be around in 12 months' time. You need to hibernate a bit and focus on the stuff that cannot be put off.
(2) Project Manager - brilliant idea. Just do it.
(3) Do you have to move house in 2 weeks> What I mean is can you phase the move so that you get your furniture over there and then don't move yourself until you have paid someone to unpack it and sort it all and clean the mess?
(4) Why not go away for a couple of days, but on good terms - you need a break from the routine, need to get some quality sleep etc. Turn it into a girly thing and go to a spa or something if you can. Tell him to use the time to concentrate on work stuff.
(5) Make a list of all the things you each do and the time you spend on each. Work out what you think can be cut back on to give you slack, present it as a solution to your DH, not a set of problems.
It will pass. Upping the ante might cause one or other of you to break, you need to cut both of you a little slack. And if you really really can't, just keep your head down and plough through until you see some clear water. It will pass. The house move will be done, you will feel less ill, DD will be off your hands a little more with school. It will pass.