CG,
Believe me, if your doctor didn't order tests when there is even a remote chance that you might have "fixable" trouble in your lungs, she would be gambling in today's sue-happy world. She's very likely just covering herself. All the health care people on the board know that medical workers have to practice defensive medicine.
Think about how frustrating it would be if, after all those tests, you never felt any better at all, and could not tell if the symptoms would ever go away?
Anyway, I hope you will feel much better soon. Take care of yourself!!
bebu