Why do you get a huge headache/ feel lighting headed when you stand up too fast?

URGENT! I hold SAT II's tomorrow but can't sleep... What can I do to variety sure I'm alert during the try-out?

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Answers:    Its probably Orthostatic Hypotension (headrush). Lots of ethnic group get them. I suggest you research it and if you aren't convinced that it is what you have, or if you muse you may have one of the conditions that causes it, you should see a physician

Feels close to a black&blue inscribe, but not? HELP!?

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This may be a circulation issue. If this happen often you can use the breath to aid you. Inhale deeply through the trunk before you stand an dthen exhale as you rise. MY son had one and the same thing followed by passing out it be called vaso vagal syncope

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