I'm sorry you've been struggling so much. Do you have a therapist -and/or a psychiatrist?
If you're concerned about bipolar disorder, I would recommend getting evaluated by a psychiatrist.
Any number of things could be going on. Aggression/irritability can be a part of depression itself (as well as anxiety). Sometimes someone who is so consistently depressed, when they feel somewhat happy, it feels especially intense because it's not what they're used to.
Are you finding that this hyperness/happiness you're feeling now is destructive in some way, or is it a generally good, but relatively stable, feeling?
If you go to see a psychiatrist if you're interested in diagnosis, one thing that can be helpful is to chart your moods over a period of time (a few weeks or more, for example), also whatever environmental triggers may be affecting you.
I wish you luck with this, I hope you can get the help you need!
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