Hi Dizzygal954, as an old sufferer of anxiety I can confirm that one of the vicious aspects of anxiety is that it can present in a hundred different ways. If as you say all medical problems have been ruled out, then your feeling of light headedness is likely anxiety. I know, I've been there and after many, many years of therapy, sometimes I still am. Yes, I too once felt light headed, to the point where I was sure I would pass out, but never did.
Please think over some very practical advice I am going to provide. First, keep in mind that you bring on the anxiety with negative thinking that you may be unaware of. (It takes a little time to discover this.) Second, remember you are the anxiety and the anxiety is you, so you do have some control over it, believe it or not. That is, your anxiety is part of your life style; it's your way of being in the world. Third, and most important, when you feel anxious tell yourself "it's nothing more than anxiety." Repeat that everytime you feel anxious, for example light headed and focus on something other than yourself. Fourth, Don't feed the anxiety fuel, i.e., fear. Anxiety is like a fire. It will go out or burn very low if it has no fuel, but the moment you allow panic and fear in, it will blaze away non-stop. The major reason people go to the ER is due to palpitations, and fortunately they are, for the most part, 95% of the time brought on by anxiety. Fifth, work on knowing your anxiety triggers. What sets it off! Then let it wash over you without fear, repeating to yourself that it is only anxiety and will soon pass. In time that is exactly what will happen. The more indifference and contempt you show anxiety, the faster it's symptoms will disappear. Sixth, be very careful in using psychiatric meds. They can, very easily, become addictive. If you have to go on a benzodiazpines, tranquilizers, use them one day on and one day off. Finally this: be kind and compassionate to the world, it needs it, and you'll find that most people will be kind and compassionate to you. All
the very best of luck, Awlright.