Found this explaination on another website from someone's doc....

He said that it's sort of a spectrum. If somebody doesn't have obvious mania/depression, but definately has debilitating mood swings, with anxiety disorder and panic disorder and some OCD they lump it all together and call it mood disorder NOS. That makes me think that soon enough, just like "Autistic Spectrum Disorder" soon the mood disorders will be called "Mood Disorder Spectrum." At any rate, those of you with kids with that dx.--that's what I was told it is. Of course, because of the liable moods, often you need a mood stabilizer.