Try to push for PFT's. Post your results after if you still have questions.
No, but see Dr on Wed maybe some tests will be ordered.
Alley
what is your diagnosis? Have you had pulmonary function tests recently?
The first step is for you to determine, with your doctor, the cause of your shortness of breath. There are many reasons for shortness of breath and only asthma or COPD or some variant of these diseases would show improvement with the use of DuoNeb or albuterol. Other causes of shortness of breath are lung disease, heart disease, clots to the lung, and a sedentary lifestyle with obesity and without exercise.
Even if inappropriate for your condition, it is unlikely that the DuoNeb would cause you to get worse. You need a good exam of your heart and lungs. You will probably need a chest x-ray and other tests. You should not delay.