I have never taken Metformin, but was ready to do so if my doctor had prescribed it. That was after doing some research and finding out is has been around for more than a half-century. It is a very safe drug, and seems pretty benign (and even has some health benefits in addition to diabetes treatment) if you do not suffer from the digestive side-effects (that is a pretty big "if" but you seem to be doing fine).
If I were in your shoes I would want to get off the Metformin but only to "avoid taking drugs" in general. Diabetes is not the whole enchilada, one can get sick with other diseases and I worry about the interactions between the drugs, and just being over-medicated in general.
At my doctor's visit earlier this week they handed me a clipboard to fill in (probably six sheets of paper). "List your medications." I handed it back to them without filling it in and said: "No meds." I am 60 years old.
The receptionist looked at me and said, "Really? It's great that you don't have any illness to deal with."
I said, "actually I have a serious chronic illness, it's just that I managed to treat it without drugs."
Big smile from the receptionist, but look of incomprehension.
Sigh.