Feels like I'm going to lose my fucking mind.

The past few days he can barely be awake 45 minutes before getting cranky AF. I normally try to get 1.5-2 hours out of him, but I literally can't do anything to please him after he wakes up and eats. He is currently crying in his crib right now because I can't even take it any more. Why can't he be awake and content for more than 45 minutes?? I'm sick of this, feels like I have a newborn half the time.