Hello. I don't know if you have already had these suggestions from doctors or others, but after some experimenting with various foods, I found that my 2-week long migraines were being caused by consuming too much sugar for too many days in a row. I also suffer chemical and food sensitivities, so I tend to have many symptoms from my body's sensitivity. From what I've read, food sensitivities are a major cause of migraines, as well as many other ailments. I would recommend trying to eliminate certain foods, keeping in mind it could take a few days (sometimes longer) for the substance to be eliminated from your system and for you to see results. There are certain foods that are more commonly connected with migraines. I don't recall them all now, but sugar is one. Also wines, chocolates, cheeses, I think gluten may be as well (in wheat, barley, rye products, etc).
Good luck.
Seren