I haven't read all the responses in this thread, but it certainly has generated a lot of interest!
Just having read the first couple of responses, I'll add my views.
My last day working outside the home was April 1, 1988. Twelve days later, my first child was born. I certainly have not loved every minute of it. But I don't regret it in the least, and I have no plans to ever return to an office job. Keep in mind that the 1980s was a very YUPPIE-oriented time. I had a college degree and a promising career. None of my friends were SAHMs. My own mother told me then, and continues to tell me now, that I wasted my education to "just" stay at home. I think there's still a lot of that sentiment out there, but perhaps not as much as the height of the ME ME ME stuff that was going on back in those days. Or maybe it's exactly the same, but I just don't care what other people think!
Eventually, people stopped asking me when I planned to go back to work. Heck, this has been more work than anything I did at the office!
I have three boys, ages 19, 18 and 17. One is a foster son. I've always done pretty much everything around the house and made most of the childrearing decisions on my own. The house is never spic and span. Lots of times, the house has looked like a disaster area. My husband will help when I'm at my wit's end and have a meltdown about it. He does occasionally take the initiative to load a dishwasher or do some laundry. If I ask him to do something, he usually does it. I'd love to have one of those sensitive husbands who steps up without being asked, but I don't. In every other regard, he's a wonderful man, and I love him more than anything.
Know that your life will get better. The kids grow up and they do chores and help. There's a pitfall that you have to avoid, however. Don't succumb to the idea of "It's-easier-to-do-it-myself." It may be in the short-term, but in the long run, no. For example, I could have simply cooked every meal on my own and gotten it on the table within 30 minutes. But, I had the kids help me whenever possible. It slowed down the process and made the kitchen a horrible mess. But they learned to cook on their own. Now THEY cook ME breakfast most mornings! And there's always someone to help with dinners, or they can fend for themselves. All of my children have been doing their own laundry since they were about 12 or 13. I only do my laundry and my husband's. I don't change sheets or make beds, except for ours. My boys are going out into the world knowing how to clean a bathroom, run a vacuum including cleaning edges and baseboards. They wash windows, take out the trash, etc, etc.
I taught them all to do such things because I wanted them to be able to take care of themselves and their own families one day. The first 10 years or so was a lot of hard work just keeping up with the day-to-day cooking and cleaning. And I didn't always keep up. There were plenty of times that I was in tears over all that needed to be done. And that doesn't even factor in all the teacher's conferences, homework help, sports and scouting events, and all the driving, driving, driving I did getting everyone to and from all of their activities.
The other thing you mentioned, about your husband being able to come and go whenever he wants, was also a huge problem for me. My husband works long hours. He felt entitled to his time after office hours. He also is a very serious runner. This means to this day, that he runs 6 to 10 miles nearly every evening after work. He runs in track meets nearly every weekend in the summer, cross-country on fall weekends, and now he's about to start the indoor track season. When our kids were very small, he also coached a CYO track team. He's a CPA and worked horrendous hours during tax season, drive an hour home from work, go to the track to coach other people's kids, then turn right back around and drive the hour back to the office and work until midnight. That was the only time I had a major meltdown. At the time, our kids were very small, and I was trapped 24/7 with toddlers. I understood my husband's crazy work schedule, but it was unacceptable to me that he was driving 2 hours to be with other people's children, yet his own never saw him, as he left the house before they woke up and he returned home after they had gone to bed. That was a very ugly time in our marriage, and we had many fights over it. But, he eventually quit the coaching. I know he loved it, but he had a responsibility to his own children, and it was hard to get that through his thick skull.
So now that the kids are older, and probably for the past 5, maybe even 7 years or so, I've had a lot more time for me. It does get better! Teach your kids to be independent, and then you won't worry when you go out for a walk by yourself, go grocery shopping on your own (oh! to this day I fully appreciate being able to shop without having to bring anyone with me!), etc. I go hiking and backpacking on my own these days, though sometimes I go with my boys, too. I can visit with friends, go to movies. etc. I do work, though. I work from home as a medical transcriptionist, and have done so for nearly all of the time that I've been a SAHM. I worked part-time up until last year. Now, I work full-time.
Yes, your husband should be more in tune to the sheer exhaustion that is part of your life as a SAHM. He may or may not change on that point. But you should continue to talk about it and make an effort to carve out some time for each other now and then. Nurturing the kids takes all of your time, but you also need to nurture each other and your relationship. Because when the stress of raising the children lightens up and you have more time for each other, you don't want to be strangers. Eventually, the children will move out, and you'll be left with each other. And that can be wonderful!
These days, I look forward to seeing my husband at the end of the day. We have time to sit and talk a bit, to go out whenever we want, etc. But it's very easy to lose track of each other when you're both exhausted and raising little ones. It's difficult to see the big picture during the early years of childrearing. Just remember, the time you have with your children at home is so very brief in comparison to the length of a great marriage. You may have fully dependent children in the house for 10 or so more years. But by the time they are teenagers, things should lighten up, and you could have another 30, 40 or who knows how many years together as husband and wife. It's important to keep that in mind. Try to be patient with each other, remember that it's difficult for both of you, and don't try to make comparisons of who is working harder. Those comparisons set up a no-win situation. You'll get through this, and then life gets really great. There is nothing, and I do mean NOTHING so wonderful as seeing your children grow into honorable men and women, capable and responsible. That's the payoff, and that's what you need to look to. Keep your eyes on the prize!