Your symptoms suggest that you are having reflux disease. Although the endoscopy done one year before by experienced gastroenterologist did not show any evidence of reflux.
Next Steps
So you need further evaluation by repeat endoscopy to rule out H pylori infection.This infection is curable with medications.
If this step does not help to improve your symptoms then you need 24 hour PH study to look for reflux disease.
Health Tips
Eat healthy food. Have adequate sleep. Don’t have the stress of this problem. The stress at this point aggravate the symptoms of reflux. So have a stressfree sleep and life