Well for the past couple of months I've had this condition where I faint often. It used to be once or twice a year and now every couple of months. I feel a bit nauseous at the beginning and sometimes I get diarrhea afterwards but no vomiting. Then I feel dizzy and now I know when to sit down before I actually faint. Some doctors have told be it's because the blood stays in my legs and others that it's dehydration but I've been drinking a lot and it doesn't happen as soon as I stand up. Can anyone help me figure this out?