Your condition is not pneumothorax, and the cause of pneumothorax (your age) is almost always trauma or surgery leading to perforation of lung wall, which reduces the pressure difference between inside and outside the lung. The symptoms are obvious dyspnea, enlarged chest and general weakness.

I am a medical student. I've seen people like you. Traditional Chinese medicine should belong to the category of stomach diseases. Mostly due to deficiency of qi and blood in spleen and stomach, cold coagulation and dampness stagnation. In western medicine, it can be said that it is a gastric ulcer.

I remind you not to eat cold and sour food, drink less and rest more.

If you have other symptoms, you should consider going to the hospital for a CT scan. Observe the heart carefully.