Uncontrolled PP blood sugar after bypass surgery

Patient: Dear Sirs,I am 64 years old male. I am a Diabetes patient for 22 years. For 45 days back I had underwent open heart bypass surgery. My PP blood sugar is not at all under control. I had consulted my doctor from whom I am getting treatment for diabetes, in connection with my uncontrolled PP blood sugar. He prescribed Soluble Insulin-Human Actrapid 10 Uts after lunch. But the Sr. Consultant Physician of the hospital where I got bypass surgery is not recommended this insulin. I do not understand the reason for it. I am very much worried about my uncontrolled PP blood sugar because I have underwent bypass surgery and I fear this will lead to harm curing the wound. I shall be very much obliged if you could help me my providing your valuable advice. Thank you,