She would typically experience a period of 'mania' and then suddenly become deeply depressed.
The band was part of the early rock-and-roll 'mania'. [='craze']
The entire city has been gripped by baseball 'mania'.
(..) No, now is exactly the time not to stop. Because, you see, I'm not getting any better! But this isn't medicine anymore, this is mania. There's some things, just can't be fixed. - Life without my work... - Is still life. This isn't the end. (..)2016 Doctor Strange