Chances are in your favor that they are CH, BUT late onset Clusters can also mimic other, more serious problems. Would strongly suggest seeing a headache specialist for a work-up.
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Cephalalgia. 2010 Apr;30(4):399-412. Epub 2010 Feb 15.
Cluster-like headache. A comprehensive reappraisal.
Mainardi F, Trucco M, Maggioni F, Palestini C, Dainese F, Zanchin G.
Headache Centre, Neurological Division, SS. Giovanni e Paolo Hospital, Venice, Italy. federico.mainardi@ulss12.ve.it
Abstract
Among the primary headaches, cluster headache (CH) presents very particular features allowing a relatively easy diagnosis based on criteria listed in Chapter 3 of the International Classification of Headache Disorders (ICHD-II). However, as in all primary headaches, possible underlying causal conditions must be excluded to rule out a secondary cluster-like headache (CLH). THE OBSERVATION OF SOME CASES WITH CLINICAL FEATURES MIMICKING PRIMARY CH, BUT OF SECONDARY ORIGIN, led us to perform an extended review of CLH reports in the literature. We identified 156 CLH cases published from 1975 to 2008. THE MORE FREQUENT PATHOLOGIES IN ASSOCIATION WITH CLH WERE THE VASCULAR ONES (38.5%, N = 57), FOLLOWED BY TUMOURS (25.7%, N = 38) AND INFLAMMATORY INFECTIOUS DISEASES (13.5%, N = 20). Eighty were excluded from further analysis, because of inadequate information. The remaining 76 were divided into two groups: those that satisfied the ICHD-II diagnostic criteria for CH, 'fulfilling' group (F), n = 38; and those with a symptomatology in disagreement with one or more ICHD-II criteria, 'not fulfilling' group (NF), n = 38. Among the aims of this study was the possible identification of clinical features leading to the suspicion of a symptomatic origin. In the differential diagnosis with CH, red flags resulted both for F and NF, older age at onset; for NF, abnormal neurological/general examination (73.6%), duration (34.2%), frequency (15.8%) and localization (10.5%) of the attacks.
WE STRESS THE FACT THAT, ON FIRST OBSERVATION, 50% OF CLH PRESENTED AS F CASES, PERFECTLY MIMICKING CH. THEREFORE, THE IMPORTANCE OF ACCURATE, CLINICAL EVALUATION AND OF NEUROIMAGING CANNOT BE OVERESTIMATED.
PMID: 19735480 [PubMed
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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. START PRINTPAGEMultimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

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

or

END PRINTPAGE Look for "Physician Finder" search box. 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. START PRINTPAGEMultimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

END PRINTPAGE 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.