I have the same thing. It's horrible. I am officially diagnosed with cyclothymia. My moods can change hour to hour, or sometimes multiple times an hour. When I cycle I either have full blown mixed episodes or rapid cycling multiple times a day. It's really difficult on me. I will feel horribly depressed and suicidal, then an hour later perfectly fine, then an hour later back down in the pits again. The mixed episodes are the really scary ones for me though.