I only recently started with the mixed episodes---that's what scared me enough to finally allow myself to be referred to a psychiatrist (and get the correct diagnosis). I always used to know when I was depressed, and when I was euphoric; this time, I didn't know if I was depressed or if I was irritable, anxious, agitated, hostile, and unable to eat/sleep/concentrate just for the hell of it. Never went through anything like that before, and I hope once I'm stable again that I never have to experience it a second time.