I found an article: disruptive mood disregulation disorder: current insight. Baweja et al.
Don't hold your breath. All this is is a placeholder diagnosis. By that I mean some words, a label to put on instead of other labels, other words.
This could be applied to kids with several different issues including autism, ADHD, etc. It was conceptualized because of concern about the over diagnosis of bipolar in children. Which was very controversial.
But this diagnosis too is controversial. Little if any research, little study to back it up.
Not to worry. You are doing everything right. I applaud you.
Please let us know what happens tomorrow.
How is he doing?
