My Brother Aged 40year Remove Insilinoma From The Head Of

My brother aged 40year remove insilinoma from the head of pancreas since 3year but now suffer from fasting hypoglycemia and neurglycpinic manfestion in early morning espisially after eat sweat at night and since operation take drug nifedpin to control postprandial hypoglycemia during work now increase the dose of this drug to control he fasting hypoglycemia. Asks you the recurrent hypoglycemia in the morning meaning recurrent insilinoma or non insilinoma pancreatic hypoglycemic syndrom