Hi welcome to the forum
@ATB123
It can be daunting starting or changing to a new meditation, unfortunately the questions you’ve asked we can’t really help with as none of us are Health Care Professionals and in any event it’s against forum rules to give medical advice.
Did your GP not tell you if and when you needed to stop the Gliclizide? The best advice we can give is to speak to your GP about your concerns and questions, he is best placed to advise you
Edited to add a sentence