Mr. lybrate-user, Thanks for the query.
Tiredness, weakness are symptoms suggesting that his diabetes
is not well controlled. First thing is to achieve strict blood glucose control
with fasting < 100 mg, PP 160 to 170 mg & HbA1c% <7. If this is achieved, his general health will definitely improve. Only other to be seen is his hemoglobin to see if he has anemia