I've had two "official" mixed episodes. 3-4 total that I can remember. They usually last about three months for me. A normal manic or depressive episode for me though usually only lasts about 3-4 months. I would highly recommend trying to stay away from alcohol, as my last mixed episode was significantly longer and/or more severe because I started drinking for the "quick fix" (which worked great in the short term, but did NOT work AT ALL in the end). I've never experienced tiredness with mixed, but the rest of your symptoms seem to fit the bill.

I'm assuming you're on meds? For some reason the atypical antipsychs (e.g. Quetiapine, Olanzapine, Aripriprazole, Ziprasidone) seem to work better for mixed than the traditional bipolar meds (but it's usually not worth changing just for a couple months - still not a bad idea to ask the psychiatrist...)

Good luck! I hope you get through it well.