Monthly planning is one of those things that many "productive" people fail to do (even I'm a culprit of this at times.) Taking a small allotment of time at the beginning of the month (or even better at the end of the previous month) to map out what is going to be happening, what needs to happen, and what you need to be successful can not only increase your chances but also reduce your stress.
Make sure you review your calendar, tasks, projects, finances, and things you want to do (yes, want is just as important as have to do and far more satisfying in most cases). As the saying goes, at this point of the month, don't sweat the small stuff. There should be plenty of time for that.