m still agitated/irritable, pessimistic, can't sit still, but i'm tired (but can't take a nap),

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That to me is just another depressive state, I get sleep all the time depressions, those are easy, if depression could be easy, and when it gets really bad that. I call it hell and if it gets worse, I'll believe I've died, am in hell and everyone and thing I experience is part of eternal suffering. It is painful to say the least.

My point? I know where you're at, been there and I'm not there now. See your doctor, he might not be able to make it stop but, he might be able to put you on drugs with such strong side effects that will distract you from this while the phase passes. Remember, you have bipolar, no mood is going to last forever. Ride the wave.