Having a baby is the most stressful thing my marriage has had to face. And from talking to friends, they concur.
One thing I learned:
Men don't always know WHAT to do. If he has not been responsible for cooking or cleaning or whatever before, don't assume he knows what needs to be done. My DH would tell me he'd do anything I told him to. That would make me furious! Why do I need to TELL him to change the baby or to make a bottle or to run a load of laundry, etc.?!?! I felt as though I was TOTALLY responsible for TWO babies -- DD and DH!!
But once I realized that he really would do anything I told him, I used it to all of our advantage. I am the planner, he is the doer. As long as there is a list for him, he'll get it done. And since it takes time for me to make the list and plan, he knows he will have a longer list than I, as I need the "think time".
When we were engaged, we dreamed of our future together. One of the things we vowed to do was to help the other person become the best person he/she could be. DH is a great doer, but he'll never be a planner. I'm a better planner than doer. Rather than trying to change that, we try to divide things to fit who we are. It makes it much easier. Perhaps this type of arrangement would work for you.
Good Luck. Know that it does get better. Really! Don't give up!
PS. Another trick that we didn't even discover until this year. The TV stays off Monday - Thursday nights until the DDs are in bed. This keeps distractions down not only for 4th grade DD's homework, but I'm finding I get a lot more done during the weeknights, so it frees me up to do other things on the weekends. If your DH has shows he just HAS to watch, he can tape them and watch them after your DS has been put down for the night (of course WHILE folding a load or two of laundry! LOL!) This has been a huge help to ME as I am more of a TV junkie than DH. Good Luck!