Migraines are usually a result of changes in the seratonin levels in your brain - the same part of the brain that is affected when you have a stroke, hence some of the similar symptoms.
I've had migraines since I was 7 (40 now). They always start with little tiny flashing lights in my left eye and not being able to judge distances. Then a slight headache, then pins and needles which start in my left arm and work their way up to my face, mouth and tongue. Then my speech goes crazy. My brain knows what I want to say, but the words all come out of my mouth in the wrong order. I can't write either as my letters get all jumbled up. I also always feel sick, but never am. This is due to your digestive system shutting down when you get a migraine, which is why it is a waste of time taking tablets once you feel sick, as they won't be digested.
The best cure I have taken for migraine is the Imigran nasal spray. You stick it up your nose and take a huge sniff up. The Imigran is in liquid form, so no worries about not being able to digest it. Its really good stuff, except for the terrible taste you get at the back of your mouth. If you have migraine with similar symptons to mine, then speak to your Dr. about the nasal spray.