I have persistent night cough. Only at night. I wake up with running nose and few sneezes. The cough(only at night, severe) doesn't stop with normal anti-cough tablets/syrups. The cough is mostly dry or comes with pure white saliva like liquid. Doesnt look like phelgm. Is this asthma or due to acid reflux? How do we differentiate? Suggest some tablets Tried Prednisone tablets (no use).