Bipolar disorder is cyclical: periods (i.e. weeks) of depression and hypo/mania with often long periods of 'normal' in between.
The overconfidence you describe could be anything. If how you see others and yourself is interfering with your work and personal life, I suggest you see a therapist to help you with these things. If you have concerns regarding diagnosis, I would bring this up with your psychiatrist, if you have one.
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