What Causes Dizziness And Stammering When Suffering From Migraine?

Hi, I m 21 female and a sufferer of migraines where I become dizzy and need a little assistance if walking further than a room away. On one occasion recently I had a very slight headache with extreme dizziness to the point I couldn t walk or stand with out help but what scared me most was when I went to talk I had a stammer. I just couldn t say more that two words. This has never happened before. The dizziness wore off after a few hours and so did the headache but the inability to speech continued all day and next two days I was exhausted. Was this just another migraine that was just worse than the others I ve had before or could it be something else? My migraines are usual menstrual however they have building up in number over the past 2 months due to stress.