Excellent headache info at:

http://www.headachedrugs.com/pdf/HA2005.pdf

I have migraines myself and this article has been very useful in my research.

Some of us experience both a prodrome and postdrome effect as part of our entire migraine cycle, was really helpful for me to identify this and learn more. One of many descriptions of this is at:

http://www.paincare.org/migraine/phases.html

Sarah