I get mixed episodes all the time. In fact, I'd venture to say that it's a prominent aspect of my illness. I'm diagnosed BP1 severe with mixed states and psychosis. For me, when I'm mixed, I feel very disinterested in the world or people around me. I isolate myself, don't contact my friends, call in to work alot, etc. At the same time, I'm very irritable, negative, and sometimes explosive. I feel the urge to do things even though I am feeling down. I have very grandiose ideas, and I am reckless with my money. I drink a lot as well. For example, sometimes I'll get a case of beer and a pint of jack, drop money on a hotel room with room service, and just sit and drink by myself until I'm highly intoxicated. If I contact my friends, it's about drinking. If they don't have money, I'll blow two days pay making sure everyone is as drunk as I am.

I can definitely relate to your post. Feeling down yet being highly volatile, emotional, and explosive. Mixed episodes are classified as either agitated depression (primarily depressed) or dysphoric mania (primarily manic). It's sort of difficult to differentiate from the two, but personally I don't think it much matters. A mixed state is a mixed state.