answer:A lot of things can cause dizziness. Orthostatic hypotension is one of them. The symptom that characterizes that condition is a lightheadedness when getting up after being supine or seated for a while. The dizziness is caused by a temporary drop in blood pressure while your cardiovascular system adjusts the pressure to accommodate your brain’s change in altitude. Most people feel fine again in a few seconds to a minute after they’ve changed position. I am not sure which doctors test this, besides a cardiovascular specialist, but it can be generally assessed fairly easily. I would suggest calling your general practitioner and asking them if they can check you out there, or if they would recommend another facility for that to be tested. Other causes of positional dizziness can be the inner ear and/or the central nervous system. As an Audiologist, I am most knowledgeable about the inner ear causes of dizziness. If you’d like to provide more specific descriptions about your symptoms, I might be able to get a sense of whether it could be an inner ear issue, which would mean seeing the ear, nose and throat specialist. Other factors that can cause or exacerbate dizziness are poor nutrition, dehydration, sleep disorders, and upper respiratory conditions. So I strongly suggest that you focus on your food and fluid intake over the next few days, and try to get sleep on a fairly regular schedule – at least until you see a doctor. Medication changes can also cause dizziness, so take note if you are on any regular medications and whether those have recently been modified for any reason.