I am now 60 years of old, suffering from type 2 diabetes for the last 25 years. Besides different medicines for heart, prostate etc, I am consuming 70 units of insulin and 100 mg of sitagliptine per day.( Janumet 50/100 two tablets per day). Still my BS is 140/200. I am under the same insulin of mixtard pen fill 30/70 for the last 15 years. Whether my body became resistant to same type of insulin?. Please share your advices and experiences.