Dear sir I can understand your concern 
in my optinion your doctors approach is good and systematic 
I would like to give few suggestions 
in 
diabetes control we need to consider diet and exercise as important as medications 
but in your case since age is factor advising extensive exercise regimen is not possible 
so mild walking is advisable if there is no comorbidites like 
arthritis.
next comes diet which can be followed by splitting meals to five and avoid refined carbs 
regarding medications 
1. considering the new medications like DPP4 inhibitors is a very good option since they are not associated with 
hypoglycemia as glynase
2.stopping glynase is a good option since there is associated cardiac problem.hypoglycemia is not good for heart.
3.regarding 
insulin it's a good option but considering insulin like levimer or glargin is preferred choice than mix.
mix is associated with more chance of hypo than levimer or glargin
mix will work only for 12 hrs and this glargin and levimer will work for 24 hrs with very less hypoglycemia than mix.
kindly discuss this options with your treating doc
regards
Dr Vamsi
Diabetologist.