Brain hemmorrhage patient. Level right?

My father got operated due to brain hemmorrhage 15 days ago. He was discharge d from the hospital & became unwell at home. So we got him back to the local hospital, after the CT scan, they suspected some infection in the brain due to which he's getting fever and becoming unwell. He was admitted for 4 days again and got discharged now. He was doing all right till day before. His sugar level is showing marginally down . Before food it's between 35 to 60 and after food it's between 60 to 80 since last 2 days. After calling the local doctor, they suggested to reduce the insulin units to 10 from 16 and asked us to stop the sugar tablets for 3 days. Is there any way to get his sugar level right? Attached the tablets he's taking at the moment. We're giving insulin in the night ,after the insulin giving some food as well. Also sugar tablets are given in the morning and 1/2 in the night. Now Doctor suggested to reduce the insulin units to 10 and stop the sugar tablet for 3 days.