I am generally not an ultradian cycler, but when I have been put on antidepressants in the past, I have. I do have a strong history of episodes with mixed features (aka mixed episodes), however, mostly those mixed features have simultaneous symptoms of mania and depression. Some had full jumps up and down. Only once did a hospital medical report label me as "rapid cycling", but that was not ultradian cycling. That simply indicated that I had had more than 4 separate bipolar episodes that year. That is not my usual, and the rapid cycling label was just that one year. My usual number of full fledged episodes is usually two or three, but they may last for some time.

Fact is, I have breakthrough symptoms a lot. They don't all meet the official DSM criteria for episodes, but some do. Though I have had some down and "mixed" times in recent years, I have a much stronger history of having numerous "blips", or "upswings" as I call them, of mood elevation. An uncountable number, since I don't mood chart. They are part of why I'm still on disability. Luck is that emergency prns and psychiatrist appointments usually stop them in their tracks. I think this year, I've had a couple official longer-term episodes of hypomania, with one having a couple full blown manic days. I have not had an official depressive episode this year. I'm not sure about last year. As for the one before that, I did have some grief over the death of my nephew. It's hard to know how much was grief, and how much really was a depressive episode. I had a couple therapists I really liked retire or move. That caused a form of grief, as well. I grieved the loss of my parrots.