Hi welcome to health care magic Here you are having acidity since month and taking antacid for few days but no improvement..... So if with life style measures and by omprazole for two to four week no improvement noted than USG done to rule out any organic cause if present Meanwhile drink more water and avoid excess spicy foods... Avoid taking stress Excess tea, coffe, alcohol, smoking avoided... Cooked oatmeal help in soothing stomach If still no improvement and cause not identified than finally go for endoscopy procedure Take care Advise : Consult physician for examination