My rib cage/stomach area is all pooched out! even when laying on my back.. diet and excercise are not helping. i have lost height; is this causing it? compression? short of breath occasionally. thank you?

It is called aging. Especially if you smoke. Check with Dr about osteoporosis.

Yes, compression vertebral fractures can cause such symptoms with osteoporosis relatively common as causing them and among others. Seeing your doc to confirm a diagnosis and looking for ways of treating and preventing further progression of your condition will be best at this point.