how do I handle it?

good question, because I have no answer for that.
I have a very crazy schedule and most of the time I know abou the job I have the day after only when I’m on my flight to destination. Check the location, I do not choose the location we have a location manager for that. Check the models, I do not choose the models we have a casting manager for that. Check the story for the shooting and the make up and hair style suggestions and the pros working with me tomorrow.
I press “music” on my iPhone, I put my earphones on and with the right music I can work on the upcoming day and the new job.
I totally trust in the people I work with, that’s why it’s easier to be concentrated about what really matters.