Yes, my question is, I am wondering if someone is having tachycardia in their sleep (and during the day under the least of stressors), plus "air hunger" (constant urge to yawn but not always able to get a refreshing breath), and chronic constant upper-middle chest pain, what lung diseases may be causing these things? And would a normal chest xray, echo, and normal breath sounds almost certainly rule them out?
A normal chest x-ray, ECHO and normal breath sounds would not rule-out all possible lung diseases and most lung diseases, especially when not severe, do not cause tachycardia. Constant upper-middle chest pain can be caused by some, but not all heart diseases and is not characteristic of lung disease.
What must be determined is what is coming first, or what is causing what. All the tests you mention can be normal, in the presence of tachycardia or other abnormal heart rhythms. Yawning suggests anxiety as part of this picture. You should have spirometry, a simple breathing test, with and without bronchodilator and 48 to 72 hour ambulatory cardiac monitoring. With this information your doctors should be able to detect the primary cause and treat it.
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