I’m not very cheery today.

I’m not very cheery today. Not sure if that is a symptom of coming back to work after a relaxing day off, or if it is to do with impending results, or the lack of a holiday, or the not-so-good news that a friend has, or the malfunction of my boiler this morning (no hot water. great), or "stuff" that is troubling me at the moment or whatever I really can not be sure.