One of the most reason of chronic sore throat and cough with none-smokers is called by public "the chronic throat reflux" which is Laryngopharyngeal Reflux. People with chronic acid reflux for years, develops chronic sore throat as the acid is going up to the way up part of the throat during the sleep time, this is called silent reflux and causes Laryngopharyngeal Reflux which is different than regular acid reflux. People who have this condition also suffers from post-nasal drainage(liquid goes to your throat from your nose time to time and sometimes severe) that causes extra sore throat and cough as well as creates an endless cycle of the problem.
Unlike being a pill-pusher, fixing GERD and Acid Reflux is all about what you are eating and your psychological mood. PPI(stomach pills) are like pain killers, they do not fix the problem, they only covers the symptoms. People use PPI pills like a candy even children are too. But this is so wrong, in recent years we understood that Acid Reflux can also happen when the acid is low in stomach. So taking PPI pill will reduce the acid where acid is needed in many cases. For that reason, a patient with stomach issues needs to be checked by expert gastroenterologist and acid tests required to decide if the patient need to take PPI or extra acid.
Please drink lots of amount of water. Do not eat fried foods, do not drink coke, coffee, alcohol, and quit smoking if there is. Increase the pillow height, make it double if you dont have neck problems. That will fix the throat as long as the acid unable to reach up. At the end, the psychology status is directly related to almost all GUT problems. As long as you think about your self and your life, it will get worse than "what you eat". The quick and the best solution is to stop thinking about anything makes you think more, dont go deep.