Bipolar Disorder Support Group
Bipolar disorder is not just a single disorder, but a category of mood disorders marked by periods of abnormally high energy and euphoria, often accompanied by bouts of clinical depression. This is the place to talk about your experience with bipolar disorder, learn from others' experiences, and find support.

"Dissociation is a mental process of disconnecting from one’s thoughts, feelings, memories or sense of identity."
https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/dissociation-and-dissociative-disorders
That talks about various dissociative disorders but I would think it's something you could have with bipolar disorder. I've certainly experienced something similar becoming almost catatonic.