this is not mania it's an elation or excessive energy because BP is characterised by a fluctuation in the dopamine so you cycle.
one missing point though how did you come out of depression. don't tell me you take an antidepressant. if this is the case then watch out for rapid cycling and mixed states
It could be a mixed state or you've been depressed so long that even normal felt manic. Just an increase of energy and being productive after coming out of a depressive episode, especially if it's lasted for long, does not necessary mean you are manic. Again, however, it can be you are in a mixed state.