I remember now why I asked the question. I should have asked "Is this a dissociation disorder". Most descriptions of dissociation disorder say that:

The disturbance does not occur exclusively during the course of Dissociative Identity Disorder and is not due to the direct physiological effects of a substance (e.g., a drug of abuse, a medication) or a general medical condition (e.g., temporal lobe epilepsy). (emphasis mine)

I frequently get migraines and wonder if the events I describe are a symptom of the migraine itself, or if they are a DD. Is there any way to tell?

If they are a symptom the the migraine then it's not a DD. On the other hand, if it is a mechanism I've acquired to cope with the unpleasantness of migraines then it would be a DD. Does that make sense?