I Recently Went To A Doctor For What I Thought
You need to get further evaluated, bronchitis or pneumonia is possible
Detailed Answer:
Hello dear, welcome to Ask a doctor service.
I read your query and here is my advice.
I think you should go back to doctor to listen to your lungs. A flu or cold ( viral infection) can last 3 to 5 days and symptoms may get gradually better . The fact that you are getting worse and producing more mucus and have chest tightness and pain means that the infection is getting worse and you may have developed bronchitis or pneumonia.
So you need to get evaluated as soon as possible and get right treatment.
Mucolytics such mucinex and antibiotics may be needed.
Hope I have answered the question.
Let me know if I can assist you further