I am not sure what kinds of symptoms you have, non ulcerative pepsia may indicate you have some inflammation in either esophagus or stomach.
You may have reflux diseae, did you do upper endoscopy? what did it show.
You may try to avoid any acid stimulants, such as coffee, spicy foods, chocolate or fatty foods, if you overweight, try to lose some weight, all those could help your symptoms resolved eariler.