Vasovagal: It sounds like you might have vasovagal syndrome. Be sure that you have had a full evaluation of your heart, brain, and blood. If all of that is normal, then you may have a condition called vasovagal syndrome, which involves lightheadedness and dizziness upon standing up quickly or sometimes due to extreme situations of cold, anxiety, or getting blood drawn, .
Answered 7/5/2013
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