Migraines :: Headache That Lasts 3+ Years?

For over the past 3 years (starting around July 2010) I have had a constant headache. It is not extremely intense but is dull and always present. Along with this headache I am also constantly fatigued and my head feels very fuzzy, like it's stuck in a cloud. I should also include that I am otherwise in good health, I am a normal weight, I eat properly, get enough sleep, can run around 7-8 miles without stopping, etc.

I have talked to a few doctors, had various tests done including a CAT scan but none of the tests ever gave any results. I was diagnosed with migraines (even though its not plural, it's just one that has never gone away) and given multiple migraine medications. Sumatriptan does not work and actually makes my head hurt significantly worse. No pain medications have any effect on the pain, I have tried many OTC and prescription meds, from aspirin and ibuprofen to stronger stuff like norcos and percocet, but nothing has had any positive effect. I have been prescribed two different antidepressants but they have the unfortunate side effect of making me tired and drowsy, which when added onto my already fatigued state makes it nearly impossible to get out of bed in the morning.

I am writing this because in the past few months my head has been hurting me significantly more and to be honest it is scaring me pretty bad. I have not had much luck with any of the doctors I have seen, they have no idea what is wrong with me and just give me scripts that don't work. I am not too familiar with migraines but I don't seem to fit the symptoms, except that my head hurts. A doctor at UCSF told me that migraines come in cycles but I could not find on the internet someone who had cycles with constant pain lasting many years at a time.