that type of migraine tends to either run in a family or be the result of a head trauma. Here is one site to check out http://www.ivillagehealth.com/librar...227209,00.html
Also, go to google search and do a search on that type of headaches. The information on the net is great!!
Do you have a good neurologist (sp?)? If not try to get one that specialist in migraines.
Try to find a teaching school if you can't afford or have access to alot of dr's.