Hi, thanks for posting the concern in HCM. 
My understanding is if you have dry or non-productive cough at night along with chest pain, that is due to severe 
bronchospasm. Xray chest will also be normal in this case. 
Some other causes should be excluded, e.g. Gastresophageal reflux disease, 
esophagitis, 
peptic ulcer disease, esophageal diverticula etc.
You may need clinical examination by a local pulmonologist and further investigations to find out the underlying cause.
The following tests may be needed-
Complete blood count, CRP, urea, creatinine, electrolytes 
Pulmonary function test 
Serum Ig E.
You may need inhaled 
bronchodilator and steroids.
For the time being my recommendations are -
Good oral hydration 
Tab Montair LC one tab once daily at bedtime for 7 days.
Steam inhalation and gurgle with lukewarm water.
For any further information, please write back to me directly. 
Regards. 
Dr Kaushik Sarkar