Hi, I have a major concern. I am in the beginning of my 2nd week, and so far I have lost 8 pounds. I am very happy, but last night I got quite a scare. I started feeling very weak and lightheaded, almost to the point of passing out. It reminded me of my diabetic grandmother who got weak and dizzy when she needed sugar. I also want to add that I had what was like tunnel vision, where my sight was blurry around the edges.