I am suffering from dry cough since 2 month, I have taken lot of antibiotics & mintekulast levocetirizine, syrup bro zedex, corex, codylex, grilinctus, but no relief. Cbc, esr & chest xray all are normal, I want to find out the reason of dry cough. Which more test require to find out the reason of such dry cough. Pls help.

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