Before 2 Months I Was Having Heartburn And Reflux Issues....Dr

Before 2 months I was having heartburn and reflux issues....Dr did endoscopy and d reports were normal....so he prescribed me to take nexpro d before breakfast and nexpro before dinner.....some how d heartburn reduced.....now I feel hungry but after eating d acids come to my mouth when I burp...or feel heavy on upper abdomen....can anyone help me what to do.....m tried taking dese medicines...have been taking them for 3 months.....
I am 20 years old and my weight is 76