mother2 - On another migraine forum I am on the topic of sinus congestion came up, and several people swore by a "neti pot" as a natural way to cure sinus congestion. Apparently you can find it at your local health food store, or buy one online.
I actually do know someone who had horrible headaches (though not migraines) that were actually a result of an intense wheat allergy. Wheat and milk are the two most common allergies in the US. Perhaps you could try restricting those from your diet as well, and see if that also helps the daily headaches. How long have you been on the restrictive diet? Sometimes it can take a while for all of the toxins to clear from your system. Are you currently under a doctors care? What has your doctor said about the continuation of the daily headaches?
I know how frustrating a restrictive diet can be. I have been on a very restrictive diet for about 2 years, and am finally getting good at putting together meals my entire family will eat! If you would like to chat, or swap recipes let me know.
Many people have mentioned dairy as an allergy, though not a direct trigger for migraines. The top two food allergies for ppl in the US are dairy and wheat. Allergic reactions can entail migraines. It is true allergies and migraine triggers are two separate things, but also true that both can cause migraines. Most doctors I have talked to suggest a restrictive diet, in which suspected triggers (or allergens) are removed from the diet and as the migraines substantially decrease (you have to be patient for this. the time it takes for your body to rid itself of all the toxins, and then take in the benefits of the new nutrition can be several months to a year...it is different for every person) one food at a time can be added back in to see if it is a migraine trigger.
Just a side note, I've found it interesting that the longer I"m on a restrictive diet, and the more my migraines clear up I find myself susceptible to things I wasn't before. For instance, chemical smells didn't seem to be migraine triggers before, but now I use all natural cleaning supplies because the smell of chemical cleaning supplies gives me a migraine. My neurologist said this is normal, and may continue to happen.