I'm trying to work things out since it appears I have something but I'm not sure if it's Bipolar or not. I get terrible moodswings, very rapid ones that can last seconds, minutes, or hours, but not much longer than that. I can go from feeling great about myself to feeling like I'm not human, going from feeling optimistic to pessimistic, my beliefs and views change as rapidly as my mood does as well. Between that and being really impulsive all the time, it's very tiring.