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It can be caused by anaemia, nerve pressure or blockage, artery block, inner ear problems, blood pressure.
There is a difference between the giddiness of inner ear problems and the fainting caused by not enough oxygen getting to the brain.
I would suggest that you look under your bottom eyelids first to see if they are paler than they ought to be. They should be a darkish pink. If they are pale it means you are anaemic. This is easily fixed.