Persistent cough

My wife is having persistent cough for more than a month now and it worsens in the night. We've had done cbc test, Ige test and pft test. All were normal. We've come suited three general physician and have had no relief at all. All they say is nothing to worry it will go away and give medicine. I am wondering if there is something else we can do to get rid of it as it is becoming really painful for her.
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Doctor Answers (1) on Persistent cough

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Please get ECHO for heart ENT OPINION for post nesal drip,and Gastro evaluation for GERD. Thest r routine causes of persistent cough. Regards.
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