I haven't had that much of a history of ultra ultra rapid cycling, but I have had mixed states (a little different, at least my case). Some medications have been more effective for me at controlling mixed states, agitation, and anxiety. Definitely let your psychiatrist know about your fast fluctuating moods. Perhaps he/she can find the right medication mix that helps with that. As for emotional dysregulation, therapy is said to be the most effective tool at curbing it. DBT (Dialectical Behavioral Therapy) and other types of CBT (Cognitive Behavioral Therapy) skills are useful. I have found CBT skills a bit helpful for managing my bipolar disorder, but more as an adjunct to medications than as a first-line approach.