Anyone else heard of this & suffering with it? My doctor told me this week that this is the reason behind some symptoms I've had lately. A sudden hot flash followed by lightheadness, feeling I'm going to faint & tunnel vision. Sucks & I don't know how to make it go away. Everything I've tried isn't working-i.e.; eating small meals all day, trying to sleep more but baby kicks a lot or I wake up every 2 hrs to pee.