<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a constant high pitched buzz in my head---not my ears, inside my upper cranium. I feel slightly light headed, but there is no pain. When the buzz is at its strongest it seems to sweep in a wave across the inside of my cranium---from my left to right. It lasts only a split second, but if it would last 3-5 seconds I am certain I would faint. I also have very slight blurriness of vision. Can this be a warning of a stroke or aneurysm? BTW, I also suffer from allergies, so---a laymans conjecture---might this be a weird sinus infection? Thanks for your attention. Also, btw, my wife is a retired crna, so you can use jargon, because she will probably understand your language. Further---I am a Classicist, so I recognize Latin and Greek cognates as they pertain to medicine---sometimes. Sincerely, Edward Danis  <response>: Hello, Your symptoms are not suggestive of any stroke or brain aneurysm. They could be related to low blood pressure values. For this reason, I would recommend you to closely monitor your blood pressure values and performing some tests: - complete blood count for anemia- a Doppler ultrasound of the carotid arteries for possible narrowing-blood electrolytes for any possible imbalances- a Head up Tilt test for possible orthostatic hypotension- blood electrolytes for any possible imbalance. You should discuss with your doctor on the above tests. Hope I have answered your query. Let me know if I can assist you further. 