Today is Wednesday and it s the third day in a row that I have experienced, nausea, fainting and a small headace (yesterday, I pushed myself and worked until I could hardly stand and ended up throwing up), went home rested and woke up as if nothing is wrong. I am pre-diabetic (about 1yr now) , so I m very alert to what and when I eat, but this situation is now concerning me, my family and co-workers. It s difficult to call my doctor because after a couple of hours rest, I feel well. It s almost feels like a very mild migrane (which I use to suffer from when I was younger), but no longer have that problem. I m female, 60yrs old. What could it be?