Cough problems. Alternative solutions!

I am 36 yrs old female IT professional. I have been suffering from some kind of chronic coughing since last 3 months. Mostly wet cough with little colorless mucus. Sometimes constant throat clearing also..The cough is especially bad mostly during night time after lying down. It stops after some time but affecting my sleep.I have taken chest X ray Patient name: Sandhya. 36y Female 22/4/18  Chest X-ray pa view.  Findings;  Lung parenchyma appears normal  CP angles and mediastinal silhouette are normal  Diaphragm is normal  IMPRESSION;  Normal chest X-ray  and done blood tests..The results are normal. My general physician diagnosed post nasal drip and prescribed antihistamines, nasal spray, GERD reflux - PAN D. But it has not solved my problem. I HAVE also tried Ayurvedic medicine for nasal congestion , cough but it did not completely solve the problem . Its a throat centric cough since i dont have breathing difficulty or chest pain etc. Kindly suggest alternative solutions