?vasovagal?: If 'ill' is nauseous, you might be experiencing a momentary drop in heart rate and thus a drop in blood pressure that happens because of some asynchrony in the normal reaction of the cardiovascular system to standing up. But headaches are not typically part of this, so I would suggest discussing with your Primary Care practitioner who may refer you.
Answered 7/13/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
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