Emma,   I see a number of issues here. First is that you need a diagnosis. Is there any history of Migraines, "sick headaches," or "sinus headaches" in your family? Migraine tends to be inherited, but in your family history, you may remember Migraines having been called "sick headaches" or Migraines that were mistaken for sinus headaches.   You've tried antidepressants, beta blockers, and gabapentin -- all in the last six months? It often takes up to three months to know if a medication is going to work for prevention.   You're right that Migraines generaly last no longer than 72 hours. However, they can and do last longer sometimes. A Migraine that lasts 72 hours or longer with less than a solid four-hour pain-free period, while awake, is termed status Migrainous. You should see your doctor or go to the emergency room if a Migraine lasts that long. See Status Migrainous - The Basics for more information.   At this point, stopping this headache or Migraine that you've had for six months needs to be a priority. When oral medications have failed, IV infusions will often break the cycle. For more information about this, see IV Treatment of Refractory Migraines.   Something you don't mention is if you're taking Migraine abortive medications or pain medications for this "headache." Taking Migraine abortive meds such as triptans (Imitres, Maxalt, etc.) or ergotamines (Migranal, DHE) or any kind of pain med more than two or three days a week can make matters worse by causing medication overuse headache (MOH), aka rebound. See Medication Overuse Headache - When the Remedy Backfires for more information on this.   If your doctor isn't able to help you, it may well be time to consult a Migraine and headache specialist. It's important to note that neurologists aren't necessarily Migraine and headache specialists. Take a look at the article Migraine and Headache Specialists - What's So Special? If you need help finding a Migraine specialist, check our listing of Patient Recommended Migraine and Headache Specialists.   Good luck, Teri