@Arella Mae,
Arella, it could definitely be a migraine thing. Of course, if it's new to you, you should let your doctor know about it because it may be attributable to something else, too.
The book cites the feeling you describe as well as stronger feelings like that one's arm does not belong to the body it's attached to or like you have phantom appendages. I always have disruption in typing skills during/after migraines - but not writing skills, oddly.