My Mom Is Getting A Stomach Pain N She Type

my mom is getting a stomach pain n she type 2 diabetic. she is on antidiabetic meds.. but her post food reading now 380.. she did an endoscopy as stomach pain didn come down.. im assuming the d reason is cos of high blood suger causing her pain , she said to ve some ulcer syptoms after endoscopy.. how should ahe controll at this time now, plz advice?