Do Glumetza And Diamicron Tablets Affect The Libido Of A Person?

I am a Type 2 diabetic and I am presently taking 2 Glumetza pills 1000 mg each daily and 1 Diamicron tablet 30 mg. daily. My question is the dosage of Glumetza too high for me to take? Does taking either of these medications affect my sex drive? I cannot get an erection anymore and it is very disconcerting to me. I am 66 year old male and I have a weight problem. Any suggestions for me? Thanks