I'm going to go out on a complete limb here and hope you see that I'm coming at this from a caring standpoint. And before anybody shoots me down, I don't come here much nowadays but posted regularly in the past, and I'm also someone that has anxiety issues.
Rosserk, I can see that you have been through a very bad trauma. This is often the trigger for something that, although I don't have myself, know a good bit about it - it's called Health Anxiety. I can't give a reason for the high levels of your readings but my guess is a fault on the meter somewhere. Nor am I saying that the HbA1c is the be all and end all of tests, it isn't. But I know many, many people with health anxiety and the one thing they all do is fixate on physical "symptoms" and obsess over them, reading up every little detail on the internet and often trying to make their symptoms fit whatever illness they think they have. Constant reassurance doesn't help, in fact it makes things much worse as it feeds the anxiety - there is also a very real reluctance or sometimes complete refusal to accept that they don't have the particular illness they are worried about.
I don't confess to know about Pancreatitis or some of the other, rarer blood sugar issues that some here have but having read this right through, it looks familiar to me. That you have got it into your mind that diabetes has to be a certain way, ie blood sugars over 12, and you are struggling when people are telling you that's not the case. Also the advice you have been given, which for the majority of us, is what makes the biggest difference to our sugar levels ie change to diet, you are reluctant to really take on board, placing the most emphasis on a "official" diagnosis. Metformin does not drop sugar levels dramatically, it doesn't work that way but you seem to have grabbed onto that, insisting that they made the big difference which is another pointer towards you feeling you need to be diagnosed.
I am aware I could well be wrong and I'm prepared to take the flak for that as my intentions are good but I think it's important that both you, and those advising you, realise that it's a very real possibility. And if anything I have said has resonated with you, maybe you spend all the spare time you have looking up Diabetes related info, googling symptoms, ie the unusual sleeping pattern and night sweats, the exhaustion - this could be just as much the symptoms of Health Anxiety as it could diabetes. I'm not saying you're making it up but most of these symptoms are very typical of a highly agitated and anxious state too. Maybe give some thought to what I've written and if any of it hits a nerve, then maybe think about how to tackle it, for instance getting a test done at your pharmacy- and if that says no diabetes, then work on getting help for anxiety. HA is really an awful thing to have to live with and I have seen many people, of all ages, caught in it's grip- for years on end. Diabetes is not easy either but you have had plenty of good advice as to what you need to do if you do happen to have it. And I'm sure you could get that pharmacy test if you really wanted to.
Wishing you good luck with everything.