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After going through your description, I learned that you are an otherwise healthy lifestyle man with good nutrition and no significant addictions. The investigations and tests done so far regarding the lung and abdominal complaints are normal, and there is no need to worry significantly about it. So I will not go into the details as everything appears normal.
Now, coming to your concern regarding feelings of malaise, fatigue, and a slight cough, it appears to be functional rather than due to any organic cause. Such complaints are due to many factors like faulty posture, faulty food, irregular food habits, and lack of exercise. So after having all the reports normal it is very difficult to pinpoint any chest or abdominal disease. So there is nothing to worry about any grave diagnosis in the absence of typical symptoms. As you said, you have long-standing clubbed fingers, and in most cases, it is asymptomatic clubbing without any underlying disease. All the differentials you mentioned are chronic conditions with symptoms at least for more than a year, and in your case, it is very unlikely.
Most of the time, it is physiological clubbing, and there is nothing to worry about (with normal CT scans and absence of chronic symptoms). Cystic fibrosis is more common in the pediatric group of patients, and it is diagnosis very obvious on chest x-ray. As your x-ray and CT scans are normal, there is no need to perform a sweat test. Also, there is no pleural effusion. So most probably, you are suffering from dyspeptic symptoms due to indigestion. So it would be advisable to continue GERD (gastroesophageal reflux disease) treatment for a month and take OTC muscle relaxant tablets for pain relief. Similarly, give attention to the body posture, type of food taken, and maintain regular food time. Include more of green leafy vegetables, salad, fruits in your diet, and avoid fast food.
I hope this helps.
The Probable causes:
Indigestion. Faulty food. Irregular food habits.Differential diagnosis:
GERD. Functional dyspepsia.Treatment plan:
Tablet Omeprazole 40 mg daily once on empty stomach, tablet Muscerol extra (Paracetamol + Orphenadrine + Caffeine) 1-1-1 after food, tablet Voltaren (Diclofenac) 50 mg 1-0-1 after food.Preventive measures: