some meds can cause lightheadedness as a side effect, also perhaps some foods, smoking can make it worse
seems to be a mystery as to exactly what lightheadedness is, did the docs give you any explanation?
look up depersonalisation on the net, maybe it and lightheadedness are similar?
when lightheaded, squeeze your keys in your hand and concentrate on the pain, sometimes this stops it a while.
get some smelling salts from pharmacist and try them when lightheaded.
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Light headed all the time HELP !!! 
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