I have had this for over 5 years, and now can tell a pattern that always happens in the same way each time I get a migraine.  First my peripheral vision gets very blurry, then my hands start to go numb, as well as one side of my face, my gums, my lips, and my arm all the way to the elbow.  I have instant confusion, at some times I'm not able to make coherent sentences, feel very confused and disoriented, dizzy.  I can not type, or even dial a phone number when this occurs.  Usually the numbness and dizziness pass within 24 hours and are not always followed by a migraine headache.  I've been told this is part of a visual migraine, and to learn the triggers.  I've found that the number one trigger was my birth control.  I tried many different types and was unable to be on any type other than an IUD.  My symptoms decreased and I only get about 1-2 of these per year now.  They are also instantly triggered by any 'fake' sugar product or diet drinks.  Stay away from these if you can!  Unfortunately migraine medicines can not stop the dizziness and numbness, you've just got to get through them.  I usually take a nap and hope for the best.