@DrewDad,
Mania. That might be it!
ma·ni·a/ˈmānēə/
Noun:
Mental illness marked by periods of great excitement, euphoria, delusions, and overactivity.
An excessive enthusiasm or desire; an obsession: "our mania for details".
Can someone be "manic" for just a short time, say 30 minutes or a couple of hours, and then move on like nothing ever happened?