How prevelanet are Hemiplegic migraine's?

Question

Are there any statistics kept on the prevelance of Hemiplegic migraine syndrome either familial or sporadic (I am guessing FHM would be easier as it is more throughly researched). I understand it is very rare- it is not even indexed as a rare disease! I cannot find any organisation focused on it or any migraine variant really. I have been having a HM for about a week and a half, at first they thought I had a stroke and then multiple sclerosis but nope nope- just an awful migraine that's disabled half of my body and put me on a cane! I've had them before, to a lesser degree and never thought anything about it... Anyway, any info beyond the basics I've already found with google would be helpful

-Nicole

Answer 1

http://www.neurologyreviews.com/feb04/nr_feb04_foramen.html

Answer 2

http://headaches.about.com/od/migrainediseas1/a/hemiplegic_mig.htm