Hello,
I was in your situation 6 years ago. We moved to Savage from MI, and my daughter was 4 and my son was 2. I know almost exactly how you feel.
I would try taking at least 1/2 an hour everyday for time alone in the house. I am sure if you explain to him how hard this has been for you and that it would really help you to be a happier wife and mother, that he would be able to handle it.
Even if you spend that 1/2 an hour taking a shower, it will benefit you, just to know that it is your time. You could take a walk, or read a book... just make sure that you are locked away with no interuptions :)
That would be a small start, and even though it is not really doing that much, it could give a little bit of peace every day.
The next step would be on your husband's day off. If yours is anything like mine, this can be tricky LOL My husband freaked when I asked him if he would watch the kids so I could get out. He knew I hadn't made any friends yet, so it made him suspicious. I just drove around and explored our new town, and listen to music :) Then I stopped at Target and wandered aimlessly... It didn't matter what I was doing, I just needed a break.
Now we live in Faribault, and he knows if I ask him to watch the kids, that I just need some time... and he also knows that I could very well be a huge you know what if I don't get it.
Hang in there, and take small steps:)
I wish I was closer to you, so I could come help you... sometimes guys don't understand this stuff.