You've been diabetic for a while then... Prediabetes is between 42 and 48, anything above that is diabetic. Not sure why your doc got confused over those numbers, what i'm confused about is why nothing was done sooner...! T2 is, unless treated properly, a progressive condition, and if nothing was done in the meantime... This was kind of waiting to happen. Thing is, carbs turn to glucose. All of them, not just sugar, but potatoes, pasta, rice and the like too. Your body pumps out loads and loads of insulin to deal with that, but... When that happens, some people become insensitive to that insulin. That's a genetic predisposition, and medication like statins, steroids and antidepressants can speed up the process as well, or even cause diabetes. Not something you can actually blame yourself for, right? So anyway, there's loads of insulin floating around, it just isn't helping you burn off the carbs anymore. So that glucose? That gets stored in fat cells, and when the stores are full, they overflow: glucose turns up in your blood, organs, urine, tears, saliva... Then you're classed diabetic, basically. The bit where you blamed yourself earlier: if you'd done the conventional thing, you would've cut back on fats. That's the advice I got too, that's what I religiously did, and that's what got me from obese to morbidly obese and diabetic. It's the carbs we can't handle, and you can't do much about that if you don't know that... And considering a lot of doctors and dieticians haven't gotten with the program yet, if they don't know, how could you? (The NHS has, now, finally gotten in on it.). Like I said, blood glucose comes from what we eat. Exception being what our liver produces in the morning, "helping" us get started, which is called Dawn Phenomenon, and what it puts out when we're stressed, or ill. Metformin practically
only tackles what your liver puts out, cutting down the liver dump by about 75%. Though it is an appetite suppressant, it doesn't actually do anything about the carbs/sugar you ingest. That's where you come in. If you change your diet -forget expensive fad diets, don't sign up for 100 pound a month courses!!!- you can get your numbers back down. Probably back into the non-diabetic range. I've seen people come in here with a lot higher than what you're starting from, and they got their bloodsugars under control in no time at all. I was diagnosed little over 3 years ago, and have been in the normal range for 3 years. Once I knew what the problem was (the carbs, oh the carbs!), I could actually tackle it. And did. Diabetes is the only ailment on my long list where I've actually got a say in how it plays out. No progression of the condition here. Which could be the same for you too.
https://www.diabetes.co.uk/forum/blog-entry/the-nutritional-thingy.2330/ <-- have a read, it's a little quick-start-guide I wrote a while ago. But all in all... There's hope for you yet.