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Lung infection encompasses several symptoms, such as cough, inflammation of the lungs, pneumonia, pulmonary congestion, bronchitis, pulmonary embolism and so on. One of the most common lung infections is pneumonia...

Breathlessness is sometimes psychological, the result of a panic attack or an anxiety disorder. Since you mention that you suffer from nervousness, this might be the case - minor nervousness might cause the shortness of breath and dry throat, which might in turn cause still more nervousness...