I have had the same issues. It all started when I was promoted at work. I started going to meetings and feeling light headed in them. Then I started feeling nervous and anxious whenever I was around a manager. I then started getting it when I was on the train. I rode the train for 4 years before this with no issues! Then I started getting chest pains for no reason...Sitting, walking, laying down, it didnt matter. They would just come and go within seconds. Well, you know what happens next, it turned into anxiety and panic.
Anyway, now I feel that I have put most of it behind me. The only thing I seem to get now is once in a while I feel this light headed/poor balance feeling. Not sure how to beat it, so I just try to deal with it.