50 over 20 mg of mercury? That is insanely low mate... like spade has said it sounds like Postural Orthostatic Hypotension Syndrome (pots).
Few things you can try... squeezing exercises and such... really a doctor needs to say what and when though, I've eard an elevated bed head is meant to help your body learn to regulate blood pressure.
Cleary she should be at the doctors and not saddos though... :P
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