Hi,
How are you?
Migraine that lasts for more than 72 hrs is known as status migrainosus. In your case it seems you have a dull ache after the migraine attack is over.
Are you taking any medications for migraine?
Medications like NSAIDS, Imitrex are very helpful during a migraine attack while Topamax, betablockers and calcium channel blockers are helpful as preventive medications.
I would suggest you to maintain a headache diary. This will help you in identifying the trigger. Meanwhile avoid caffeine and alcohol if applicable. Lie in a quiet dark room when you are having the attack and apply cold compresses on the head and neck and do some breathing exercises.
I just found this on the web. It might be a good answer for you:
http://www.ncrdoctors.com/ncr_world_business_news/world_business_news_special_report.html
found at this site:
http://www.drboyercole.com/faqs.html
Good luck and take care!