I came across a blog called lousmenstrualmigraine.blogspot.com
This contains some very interesting links to you tube showing a neurologist explaining the link between vitamin d3 deficiency and chronic pain including migraine ( not just menstrual)
I have already ordered a high dose vitamin d3 (2000iu) and am going to my GP for a blood test.
The links take about an hour to get through but are fascinating and the bottom line is try taking a high strength vitamin d3 (not d2) and get a blood test done. Then see if it works.
I thought I would share this with you as this is something I've never come across before and is worth a try for anyone as there are no side effects used correctly.