My migraines were always on the left side and they were caused by gluten, a protein found in wheat, rye, barley, oats. My female cycle played a part also, as some days gluten didn't affect me.  I don't eat bread, bagels, cakes, cookies, pasta, etc. unless they are special gluten-free versions.  I've also found that caramel coloring or flavoring causes migraines, as well as annatto, a natural food coloring.  Alcoholic drinks cause the same.  Now, I have migraines caused by disc problems in my neck and they start at the base of my brain.  Doctors always want to know what side of the head...but it never helped them solve my problem!  Try an elimination diet for gluten for 2-4 weeks?  Supposedly, an allergist can test for gluten/wheat, but mine didn't. 

Yours sounds so much like mine!  I've had trouble for about 12 years (and even earlier if I think back).  Since April, I, like you, have had very few pain-free days!  I know that feeling of desperation.  I have had quite a good response with my current neurologist.  We first tired Topamax, but my body couldn't take it.  Then we went to Verapamil 120mg and I can't say if that one did much or not.  Finally a couple of weeks ago, we decided to add amitriptyline 25mg and up the Verapamil to 240 mg.  The very first night, I felt the pain dissipate!  The side effects (sleepiness) also decreased after a few days (although I sleep much much better now!)  I had a 4-day bad streak last week and finally went to a recommended chiropractor (yet again...) but this guy did something!  I woke up Friday morning pain-free and have been for the past 3 days.  I'm hopeful that we're on a good stretch now -- but it's a combo- preventives, supplements (B2, CoQ10, Magnesium, Fish Oils, Calcium -- see Teri Robert's suggestions), and chiropractic.  At least I have hope today.  I hope you can, too!

Good luck!

Kim:)

I say all this to say, don't lose hope!