The lung imaging appears to be normal which does not exclude but strongly suggests that the problem is outside the lung. Common cause of a dry cough at this stage would include taking certain types of blood pressure medications (you need to check this out with your doctor), a chronic post-nasal drip, acid coming up the food pipe (and hence the trial prescription of antacids). Occult asthma can often also cause a chronic cough. I would suggest you work with your doctor and note the response to the antacid treatment. Occult post-nasal drip and use of an antihistamine would be strongly suggested. You can discuss these possibilities with your doctor.
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