My hubbie worked away when the kids were this age. Exactly 2 years apart they are, and he worked away from Monday, coming back on Saturday lunchtime usually. It's hard doing it all yourself, though I really had no choice. What I resented is that he felt, and told me, that Sunday was his day off. He didn't see why he should spend it looking after the kids. I never expected any help with house, cleaning, washing, bathing the kids, or any of the hard stuff. Just spend some time with them so I could catch up on sleep, or even the washing!!! He went down the pub, came in, ate his dinner, went to bed, and went back to work Monday until next weekend. Eventually, we separated. This is ebcause I sat and simmered, rather than argued my point. I resented, until all love and respect was gone. Maybe, it would ahve ended up no differently, but do wish now I ahdn't opted for the quiet life. There was more to it than that. Apparently, I got boreing when I had kids. Didn't want to party any more. Mmmmm. Wonder why. But the point I'm trying to make, is talk, talk and talk some more. Not shout and nag, but tell him how you are feeling. Tell him, it's ahrd. Also, wake up on Sunday, get dressed. Arrange to meet a friend. Wake him up and tell him it's up to him because you're going out. Leave him to it. Might make him realise it's not that easy. Rewarding but hard. I did that, it diud hrlp, but by that time it was already too late.
Good luck