I think that mixed episodes and rapid cycling are 2 separate things. I have had where I'm severely depressed then in the afternoon switch to uncomfortably energized but no longer depressed. Other times I know it is mixed, usually being hopeless and suicidal along with the physical in-your-body agitation, excess energy and inability to stand still like others described. The mixed episodes seem worse. I don't know if I could stand it if they lasted more than a week.