That sounds like a great idea, this stuff is utterly exhausting and you are entitled to some time away. And sometimes just making a decision like this helps you feel more in control. I know when I booked our Easter holiday I felt a lot better, and would have done even if he hadn't agreed to join us for some of it. Maybe you could frame it as him being able to spend time with the kids once his big work thing is out of the way? It might come across more positively then, let him see for himself that you're taking care of you rather than telling him.
