Hi, unilateral headache with characteristics you describe could be migraines, but migraines especially for those with typical presentations would be accompanied by nausea, visual disturbances. Other primary headaches like cluster headaches could have same presentations. There is another unlitateral headache, which in your case could be like is temporal arteritis. Its worth consulting and doing an erythrocyte sedimantation, an examination that measures the degree of chronic inflammation. Raised levels could be suggestive of temporal arteritis and appropriate treatment given. A consultation with a neurologist could be of help in clarifying whether its a primary or secondary headache, and maybe some other blood or morphological tests. Some of these diseases like temporal arteritis if left undiagnosed, in some rare cases could rapidly evolve into blindness if the optic nerve gets involved. Its a matter of urgency to get a neurologist consult you. Hope this helps, Thanks and best regards, Luchuo, MD.