I have researched other websites about this and I can not believe how many other people have this problem. But no one has an answer as to what it definately is. I yawn and yawn and yawn sometimes several times in a few minutes just to get a deep breath. I try so hard to breath that sometimes I cause pains in my chest from over extending my lungs too much. But most of the websites all say many different things it could be: asthma, hypertension, panic attacks, collapsed lung or partial collapse, anxiety, etc. etc. etc. Seems no one has yet to have a correct answer from a dr. I know that yawning is just a way to get extra air in my lungs but it is not something that I should not worry about. It is the reason that I am yawning is the problem. And yawning consistently to just try and breath and still can not get a deep breath is a major problem.