Thanks for the quick response.
The accident catches my attention for headaches can arise from head injury, sometimes with a time delay between injury and onset. It's possible that you have the symptoms of Cluster but don't have Cluster headache as a primary problem. (That doesn't help you, I understand, but it's by way of asking....)
Have you consulted a headache specialist? Not just any neurologist, even your primary care doc, for they often lack the deep skill needed to treat complex headache disorders. Suggest you explore the move with your current doc.
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LOCATING HEADACHE SPECIALIST
1. Search the OUCH site (button on left) for a list of recommended M.D.s.
2. Yellow Pages phone book: look for "Headache Clinics" in the M.D. section and look under "neurologist" where some docs will list speciality areas of practice.
3. Call your hospital/medical center. They often have an office to assist in finding a physician. You may have to ask for the social worker/patient advocate.
4. Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

; On-line screen to find a physician.
5. Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

Look for "Physician Finder" search box. Call 1-800-643-5552; they will send a list of M.D.s for your state.I suggest using this source for several reasons: first, we have read several messages from people who, even seeing neurologists, are unhappy with the quality of care and ATTITUDES they have encountered; second, the clinical director of the Jefferson (Philadelphia) Headache Clinic said, in late 1999, that upwards of 40%+ of U.S. doctors have poor training in treating headache and/or hold attitudes about headache ("hysterical female disorder") which block them from sympathetic and effective work with the patient; third, it's necessary to find a doctor who has experience, skill, and a set of attitudes which give hope of success. This is the best method I know of to find such a physician.
6. Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

NEW certification program for "Headache Medicine" by the United Council for Neurologic Subspecialties, an independent, non-profit, professional medical organization.
Since this is a new program, the initial listing is limited and so it should be checked each time you have an interest in locating a headache doctor.
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What is the med which your insurance won't cover?
Normally, you would be started on a preventive med along with the sumatriptan--and they are cheap and covered. But the suma aborts the immediate attack but has a short life; the preventive med is used daily and it reduces the frequency and intensity of attacks. It's not an either-or issue.
I'm uncomforable suggesting this and that for Cluster if, in fact, you have a cluster-LIKE problem. Your doc will understand this distinction and it may have some important impacts on how you need to be treated.
Get some clarity on these questions and get back. Then we can start feeding you some medical guidance which is appropriate.