'Bipolar' is already in the medical sense; it does not mean 'a change of heart'. I think that would be 'ambivalent'. She is bipolar: for a period she's euphoric, and then for another period she is depressed.
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AnonymousCan you give me an example with the use of in the medical sense?How about googling for some and posting them here?
AnonymousDo people say during a period instead of for a period?Not 'instead of' but 'in addition to'.