Numbness on right side of head/face, w/uncontrollable muscle twitches/jerks in right arm & hand. neck mri reports show nothing. what's causing this?

See your physician: These symptoms may represent a specific kind of headache (migraine) or other neurological condition, seizure, referred neuropathy, etc. Keep a log of the location, timing, duration, characteristic, and intensity of these episodes and take the log with you to your physician. You might be referred to a neurologist. http://www.nlm.nih.gov/medlineplus/ency/article/000647.htm