Poor control of diabetes type2

Patient: I am a 64 year male. I am suffering from Sarcodosis for last 10 years and presently on Defcort 6 half tab. OD. I have gradually developed diabetes type 2 for almost 7-8 years. un till last year August Zoryl 2 OD was giving good control, but now the blood sugar level (fasting) varies from 180 to 220. recently my doctor has advised zoryl M-2 one tab in the morning and 1/2 in the evening but it is not giving control over diabetes. Please help

Symptoms: Bad throat and dry cough