Have a catscan of your sinuses. Go to an allergist. Then to a neurologist. The sources of headaches are individual, but if you're getting headaches suddenly out of the blue, you need to see your doctor for more than a blood test. In all my husband's years of fighting migraines, I have to say that "cause" has never been determined. However, my five-year old daughter was once found to have fully blocked sinuses from an infection (catscan of sinus cavity). She had been getting headaches. The doc gave her an antibiotic and then sent her to the ocean for a snout-full of salt water. And you know what? It worked. A friend of mine had her sinuses surgically cleaned. The result was life-changing--and positive. The bottom line is that your persistence will pay off, at least in small ways. Persist in finding the cause of your headache. If a neurologist finally says, "Nope, you've got unremitting migraines, then start expanding your list of coping skills." Find lots of ways to cope strategies. Rule out nothing. Make every sensible treatment part of your arsenal, including dailing yoga, meditation, sinus flushing (netty pots), antihistamines (if needed), decongestant (if needed and tolerated), and abortive therapies--the tryptins and other pain killers. Don't forget that stress can cause migraines, too--along with grinding your teeth while you sleep, clenching your muscles while sitting at a computer, having the wrong type of glasses. My second-hand experience tells me that headaches have to approached with way--from 10 or more angles at a time. Make sure you're not having rebound headaches form pain killers. Migraneurs don't want to hear it I've discovered, but questioning yourself is absolutely necessary. Are you overusing pain killers? Do you really need a pill every time? Avoid the panic approach to chemical pain killing. You really can set up rebound headaches and rebound pains throughout your body--and you can diminish the effectiveness of pain killers for the truly monster headaches, the one that blast away in your head. When you really need them, you want them to be effective. Good luck.