We started family life in your position. We had the luxury that I could be at home full time whilst our children were young.
Mr's salary paid our essentials and a cheap camping holiday out if peak season each year. Wasn't bells and whistles but it was a break
My Mr came home after bedtime, didn't eat with us, had to work at weekends, was hard to commit to anything really.
So I understand your frustration.
But it's also a luxury. Having one adult not economically active nowadays is a luxury.
Our two children are just over 2 years apart. And what do you do?
You accept that until your son is at nursery from 3, think you get 15 hrs a week, then school and same for second you accept this is your life for 5 years and try and build up your business if/when you can. Or get a part-time job that will cover childcare and a holiday but working for someone else.
I didn't have much time "off" until youngster went to pre-school. But it happened looking back in the blink of an eye.
Admittingly once babies in bed I didn't do any housework after that. I tended to let things slide at the weekend because why shouldn't I have one as well. Our house was chaos at times but we had clean clothes, good food, fun, play, just cleaning windows/oven/hoovering under furniture was a major undertaking.
Now looking back the Mr knows he couldn't have any more time with the kids when they were small than he did. He wished he did and always didn't want to miss a moment when at time in the moment sometimes we all feel that you just want a break.
But breaks aren't what babies or toddlers are about.
I found if I woke before them, particularly in the summer, it was the only hour in the day I could have a coffee and indulge in reading fiction in peace. The golden hour.
All I can suggest is you try and carve out those golden hours for yourself. Whilst son naps do your work, even if it's on a laptop whilst he watching children's TV for an hour or two it won't damage him.
If you want another child then you are back not only to square one but until youngster goes to nursery you will have even less time than now. So I would, well it's what we did, back to back almost and accept that until child is 3 you and free time are non existent or at least not predictable. Or just stick to one child then this time next year you will be on the home straight.
You could try appealing to husband's parental side saying you are missing his childhood. Which he is. And he'll likely regret it. But it does sound like his job which will reap rewards in the future does have to come first at times because money, and hopefully not having to worry about money is important as well.
It's a balancing act.
It really in the grand scheme of things doesn't last long.
But resentment won't help.