Those sound like mood swings. Bipolar swings are usually much longer and the episodes of mania are more pronounced. Im not saying you don't have it, but judging from that it doesn't sound like bipolar to me, personally.
It does sound, actually, more like the mood swings associated with depression, as well as some of the symptoms of depression.
I would talk to your therapist.
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Everybody knows that
You'd break your neck to keep your chin up