Sam - I was diagnosed 3 weeks before leaving the UK for 9 months, so you can imagine the whistle-stop tour I had of diabetic nurse, optician etc.
On diagnosis I asked about testing, to be told I didn't need to, but I could have some urine test strips - which never showed anything up. They only work at 10+. By the time I saw the nurse almost a week later, I had bought a glucose meter in Boots and started testing. Dr Google taught me how to do that bit. During my appointment with the nurse, I got all the usual messages and by the look on her face you'd have thought I had taken up home vivisection, rather than self finger prick testing. She asked what my levels were, and I responded. She looked at me disbelievingly and with the most sneering of expressions asked when I had last eaten and asked if she could test me there and then. She patently thought I was lying. I wanted to kill her for that look alone. I can't recall the score; it was about 7 or 8, I think, but certainly a significantly better score than she was expecting. The look of abject horror on her face confirmed my earlier view, and at that point I lost all respect for her. But, fortunately, 4500 miles was far enough to ensure I wouldn't encounter her unexpectedly!!
In the end, I split my trip and came home for a couple of weeks after 4 months. By then, I had reduced my carb intake and had a handle of what worked, and didn't for me. My HbA1c had reduced from 73 to 37. Lipids, BP weight and everything else was well within targets and non-diabetic ranges. The only downside of Nurse ratchet having retired was that I couldn't see her face that time. I had no baggage with the nurse I saw at that point, so it was a simpler appointment. All she could say was that I should keep doing as I was.
Since then, my bloods have further moderated to 34 and 32. I don't think I'll be going any lower.
You have to be true to yourself. If you want to demonstrate exactly how your bloods go, you could decide on a 24 hour, low carb, meal plan, and test to your protocols - fasting, before and after meals, then repeat the process but adding carbs to the same(ish) menu and test again in your usual way. When I say add carbs, I mean, have potato, chips or rice with the steak or pork chop. But, keep the core foods the same both days.
I would do the low carb day first, followed by the carby day, then revert to your low carb plan. That way, you can comparatively demonstrate the impacts to your doctor. OK, it's an incredibly brief trial, but if you take your food diary and blood scores with you - probably combining the food and blood diaries, running the days side-by-side.
When they say we shouldn't test, I asked if they would be happy to go along with that if it was them. I sort of got, well, I'm different. They could not explain, to my satisfaction exactly what the valid differentiators were.
Sadly we all go through this bit. It's pretty rubbish.