It feels stuffy like there is phlegm in my bronchial tubes.

I caught a sore throat in early summer, had a cough and a sore throat, went to the hospital for treatment, took medication, and recovered, but since then, my bronchial area has been...

I'm feeling so frustrated and anxious that I even had an X-ray taken, but no abnormalities were found, and it has been ongoing. It feels like there's phlegm stuck, causing a sense of suffocation, but there are no other issues, and it might be psychological.

So, I have been consistently taking only the Yonggaksan powder recommended by acquaintances. I would appreciate advice from those who have experienced similar symptoms.