As the diabetes
progresses in type 2 diabetics,the mass of functionally active beta cells in the pancreas
starts dwindling and soon a stage is reached where the mas of active beta cells is reduced to a minimum and this is the stage when oral diabetics loose their efficacy and they become ineffective even at the highes possible dose.This is the stage where injection insulin
has o be added and you seem to have reached this stage and that is the reason your doctor has put you on injection insulin.
As far as control of blood sugar is concerned,it can be achieved gradually by titrating your insulin dose and oral anti diabetics.
The goal of fasting sugar should be around 100 to 120 .
The goal of HBA1c
should be below 7.
Keep taking your statins for your cholesterol
,even if your cholesterol levels are normal.