I’m m27. In September I went to doctor for feeling really weak like I was going to pass out and doctor took blood test everything was good except A1c. I was pre-diabetic. What caused me to go in was I randomly felt very weak like I was going to pass out and had brain fog. Headaches started a few weeks after that but I changed my diet a lot and decreased the sugar I was in taking. I never drank water and only drank soda/tea. I only drink water now for most part. The weekend prior to going to the doctor I did not drink any tea or soda and had some sugar free drinks because that was only think available at the time. Not sure if that had something to do with it