Hello Sir, I Am Jaw. I Am 36 Yrs Old.

Hello Sir, I am Jaw. I am 36 yrs old. I had been taking Glycomet Gp 1 since January 25th. I take one tab everyday after a good breakfast in the morning. I am feeling better than before. But, to my surprise I gained 5 kg in these three months though my food intake is more or less the same. Also I feel week and sleepy sometimes. Also I achieved a tendency to eat more which I avoid always. I have not tested my Blood Sugar levels after January 24th 2016. Please advice me the side effects of the said medicine. My father is a Diabetes Type 2 Patient since 25 years. please do advice me what to do next.
Regards