This sounds like something you should take up with a doc, maybe a neurologist, I do not see this as any symptom related to being Bipolar. You may ask your pdoc if it has anything to do with what meds you are on, that is if you are taking any med for Bipolar.
If this were me, I would question my doc about it, I would say it is not anything to do with being Bipolar.
If you haven't hada physical for awhile, you may want to go get a checkup, and see if there is any underlying physical thing going on, several things can cause this sensation, so I myself wouldn't wait on it, get some medical advice.
Lots of luck to you

DE

In giving advice seek to help, not please your friend
SOLON