Uncontrollable yawning, shortness of breath what could it be?

tomorow marks day 7 of this wierd condition.

basicly 6 days ago i started yawning and i keep feeling this strange mild shortness of breath. it feels as if im holding my breath though the rest of my body is perfectly fine. this feeling only goes away when occasionaly ( maybe every 5 - 10 min) i take a REALLY deep yawn and then i feel relieved for about 30 seconds with a pinch of lightheaded. and then it comes back.

well the wierd thing is 5 days after i had it (yesterday) i woke up perfectly calm and i did not yawn. (i might have yawned once or twice when i woke up but that sounds normal) today though in the morning i woke up to go to work and it started again and very constant. By now my back hurts ( i think from my lungs expanding to max capacity so much) and i also feel mild pain in the very middle of my chest, by that bone area there which is probably same cause. ( not the heart at all)

so how possibly serious MIGHT this be? maybe it is stress? im not tired at all...

ran out of space above : i tend to feel a need to yawn more then once a minute, though it seems i cant do it for somereason its like im stuck. ( which is why this is so annoying) i only get a very big deep yawn every 5 - 10 min. and thats when i feel relieved of this feeling that makes me want to yawn...

My unprofessional opinion?
Sounds like anxiety...(something I'm very familiar with)...the more you pay attention to that feeling the harder it gets to take a deep breath...yawning tends to help breathe fully which is why you ARE yawning...get checked out absolutely, but chest pains and anxiety are common.

There is the possibility that you have the beginnings of emphasema, or possibly spontaneous pneumo-thorax. The back pain sounds more like spontaneous -pneumothorax than anything else. it is a small hole in the lung, allowing bleeding into the chest cavity, placing preassure on the heart and lungs. I would go to the emergency room immediately, as it can lead to heart attack, or lung collapse, or peritinitus.
Hope this helps.

you are probably just tired-take a day or 2 off from work, and go on vacation and sleep, sleep, SLEEP!!!!!!!

I'm not sure, but it could be breast cancer
http://www.webmd.com/breast-cancer/tc/Br...
Pleural effusion, where fluid gathers in your lungs
They could also be panic attacks
http://blogs.webmd.com/anxiety-and-stres...
Among others.

In all cases, I insist that you find a doctor.

Yawning is great for your lungs.. but too much will lead to hyperinflation which is why your back and chest is hurting because the compliance of your lungs when you yawn pushes against the muscles behind your lungs and also pushes against your intercostal muscles in the front. You'll notice that it is between your ribs that hurts, not just your chest. Yawning can be decreased by getting enough sleep at least 8hrs a day. If you've not been getting that much, you can also try sleeping in the afternoon to catch up your sleep. Try to not work your self to the extreme daily and exercise and get a very well nourished diet.