I get the woozy feeling, and lie down on the floor and just breathe, I usually feel hot as well, have never actually fainted, bu tI pick up the symptoms, pretty quick and get down before I do. Mine is from low blood sugar, if DH is around he gets me chocolate, and forces" me to eat it!! make sure you mention it to the dr as he will check up on Bp, blood sugar and iron levels, as all these things can cause fainting.