I am 24 years old 5 6 and I am a healthy woman, but i do smoke cigarettes. Recently I have been getting very light headed. For example while driving the other day this feeling came over me. It started in my head I gasped for air and when my body gasped it felt like it brought me back to reality. I was about to pull over on the side of the road. I felt sick after that went home and layed down. A few days went by and it happened again yesterday while working at my computer the feeling came over me again it started in my head and i shoock it off and it went away.. I can feel it coming on and soon as i feel it I move and it goes away.. Please help!!!