There are many causes of chronic cough. One of the most frequent is chronic hay fever or post-nasal drip. It sounds like you may have had this. There many different types of antihistamines and perhaps you would benefit more from a different one. There are also anti-inflammatory nasal sprays that can be used. Other causes could be acid coming up the food pipe, or lung disease like asthma. I suggest you see a lung expert to sort through these and get some sensible advice.
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