Our expert says:
In view of the normal chest X-ray, and chest examination, it is very possible that your problem is due to and uncontrolled post nasal drip or gasto-oesophageal reflux disease. You should consult an ENT surgeon who may examine the upper airway to establish a possible cause. If you are suffering from a PND (post-nasal drip), it may be due to chronic sinusitis, which will require a CT scan of the sinuses to assess the extent.
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