Have a cough for 6+ weeks with chest pressure and pain, fatigue. had a ct it came back normal. lungs sounded clear one week ago. what's going on?

Seek a pulmonologist: Chronic cough has multiple causes, defined as a cough lasting more than 8 weeks. Post nasal drip, GI-reflux disease, asthma, medications, bronchitis including lung or THYROID cancer. Details of the history such as clearing throat, symptoms after food, symptoms with exertion are all useful to sort out the cause and requires a detailed history and physical by a lung specialist or internist.

Hard to know: Could be as simple as a cold that would have cleared, but with residual irritation/cough. As likely may be rhinitis due to infection or other chronic condition such as allergy creating post nasal mucus drip and subsequent irritation. It is sometimes due to acid reflux, undiagnosed asthma (although your lungs sound clear, breathing test can confirm) or vocal cord problem. Or medication side effect