Hello there.
I was diagnosed last October (where did the time go?). My HbA1c details are in my signature, and I don't take any medication. I never have. At diagnosis, I wasn't terribly overweight, but I have trimmed up, and now weigh in at 49/50kg, like you. Personally, I don't want to take medication if I can avoid it. Yes, I watch what I eat, but I very rarely feel deprived.
As I understand it, Metformin only has a limited impact on bloods. The impacts of Metformin are in acting as an appetite suppressant, thus the overweight remarks, and secondly, it helps with insulin resistance. I can understand the confusion isn't helpful. Having conflicting advice from the same team would be very frustrating for me.
Did you question your doctor on his recommendation? I can understand why you might not, if you weren't expecting that development. I might have been dumbstruck.
But, moving forward.
How do you feel about your HbA1c? Are you happy with it, or do you really want to get it lower? Persoanlly, I want to run at non-diabetic levels, and I seem to be able to do that, without too much angst. If you want it lower, and taking medication doesn't phase you, it could be worth it for a few months, as a trial? On an upside, if you take diabetes medication, you qualify for free prescriptions for 5 years, irrespective of whether you stay on the meds, or not. Of course, that should never be a driver in deciding whether or not to take medication.
Let us know what you decide, and if you want any further information, please just shout.