Word describing the reversal of emotions



A boy is highly confident one day and the next day scared, timid and shy.


A girl is emotional one day and emotionless the next.



Is there a term for a drastic switching of emotions? A term for the switching to practically opposite emotions?


EDIT: Just to clarify the emotional changes are not rapid, and are permanent. This rules out bi-polar, because bi-polar involves multiple periods of change. I'm looking for a work to demonstrate the steepness or contrasts of change, but having no relationship to the speed of change.


Example:



Over a course of 3 years a once quiet boy become the spokesmen of the school.




Answer



There are some good answers already, but to pitch in.


Cyclothymia could also be considered.


BUT! It might be more appropriate for:



  • Mood swings (rather that emotion swings)

  • A more severe/serious condition.


But it does fit to:



drastic switching of emotions



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