How Can I Better Control My Blood Sugar With Diet And Exercise While On Glycomet SR Twice Daily

I am diabetic and take glycomet 500 sr twice a day. but my recent sugar level is 112mg/dl fasting and 177mg/dl pp. even with these medications i am not able to bring my sugar level within normal. I have also followed diet modifications and exercise. I dont want to add medications to my body. can you help me out with my sugar level?