This is interesting. Does it happen before every migraine, or just sometimes?
Have you got yourself checked out? Hope everything is fine but that shit would scare me like hell at least the first couple times.
Almost never. Once every two years or so. But it first happened when I was 15 and I thought I was dying! Turns out it runs in my family. When I told my mom she did the whole "there's something you should know..." It was like a superhero backstory, except it sucked instead.