I have had panic disorder all of my life.. I'm 29 now and have had panic attacks since I was a child. I think I have experienced every anxiety symptom under the sun, but this one just began recently. I actually just posted some interesting information that I found online in the GAD section and it talks about "hyperventilation" which sounds like the problem.
It's like we're breathing too much and are far to aware of the breath which is supposed to happen naturally. Years ago I was actually convinced that I had asthma but I never did wheeze or cough much. Now that this "breathing problem" is cropping up again and I have been generally VERY anxious recently, wonder if I ever did have "asthma" symptoms to begin with. I doubt it!