Suggest Remedy For Persistent Cough

I ve been suffering from severe cough. I am a female age 44 I consulted some doctors and they told me that the cough is due to the gatiscs and told me to avoid oily and spicy foods, I am suffering from this cough for a long period and heiplessl Once I did endoscopy and because of that I suffered for long period of stomach pain so I am afraid of doing encoscopy can you all suggest me a way to get relief from this severe cough I have this most in the night time and couldnot sleep. Please can you help me?