Your old life is over. A new one awaits. It will most likely be better, but no doubt different. Relationship: don't keep a (mental) score of changed diapers, chores etc. with your spouse. You're not roommates. Team work isn't perfectly balanced or symmetrical. You: Everything is just a phase and will soon pass. Remember this, when things are tough. Also, don't be confused if the first months feel more like a struggle…
Came here to say this.
Kids go through phases like not sleeping well for weeks on end. It will pass. You'll go through periods where it's easy and the kids sleep through the night. This too will pass.