Ive had those sexual headaches myself; long time ago and only twice. They were that bad I that remember them. Clusters are a different type of pain. It only took a small amount of reading online to realize I suffer from cluster headaches. If you dont know if what you have is a CH yet, give it some time and you will know for sure after a cycle or two. Dont trust a doctor to diagnose you unless he is experienced in CH diagnosis. Like Pete said, keep a journal. A journal is good to look at to monitor the duration of your cycle, headache severity, diet, sleep, abortive's and other factors. It is good reading to compare cycles. For eposodic suffers (like me), you may have details in the journal that you may have forgotten over the past year or two that may help you with resolving the current cycle.