Sore throats are usually caused by viruses, not bacteria, and are often associated with post-nasal drip. Any sore throat that persists for more than 7 consecutive days should be cultured for strep, especially with a known exposure.
The same is true for lung congestion, a feeling that can be experienced with a great variety of lung diseases, infectious and non-infectious. Lung congestion of several weeks duration definitely warrants a chest X-ray.
Anxiety is not uncommonly associated with chest discomfort, a feeling that one won't be able to breathe, with hyperventilation and with the feeling of a lump in the throat. It is also associated with heart palpitations or a rapid heartbeat, sweating, tremulousness and a generalized fear that something bad is happening or about to happen.