Hi Emma and welcome from me too.
Did your Diabetic nurse give you a Blood Glucose Meter to test your own blood? With such a high HBA1c they have discretion to do so I believe. My practice nurse gave me one and I had a reading of 112 at diagnosis. If not, ask for one. She can only say no. If that happens, you can buy them quite cheaply but the test strips are the part that runs up the cost. The CodeFree Glucose Meter is the one recommended here on the forum because the test strips are the cheapest.
Well done on your weight loss so far. As others have said starchy carbs also need to be reduced as well as the sweet stuff. If you can cut right down on bread (and swap your regular loaf for a low carb option.... many people here sparingly use Bergen or there are other options.... and avoid breakfast cereal and even porridge which is usually considered healthy, you should make good progress. Breakfast porridge was the final carb meal that I cut out and only then did my BG levels start to drop below 10.... I now have a mushroom/ham/cheese/onion/aubergine/pepper mix and match omelette with a side salad or the Milbona Creamy Greek Yoghurt (lowest carb natural yoghurt I have found so far) from Lidl as
@belugalad mentioned with raspberries and pumpkin seeds for breakfast and they both work well.
Eggs are usually great for diabetics and it is always a good idea to eat more oily fish. If you find eating a lot of green leafy veg hard work, a small dollop of butter or cream cheese mixed into it makes it so much more appetising and if you are eating very few carbs, you do need to get your energy from somewhere so increasing your fat intake a little should help with that.
I am so sorry to read that you are suffering neuropathy in your teeth. That must be awful. I do hope that settles down a bit once you get your Blood Glucose levels lowered.
Good luck and keep us posted with your progress. We are pretty much all in the same boat here, so we know how mind blowing it is, particularly in those initial few weeks/months. Once you get your head around a completely new way of eating, it can be very enjoyable. I was a sugar and bread addict and I don't eat either now. I will confess to keeping a pack of sugar free sweets in the car (Sula Rhubarb and Custard are so nice my partner also eats them) but I don't really miss all the sweet rubbish I used to consume and I love the feeling of being more in control rather than craving sugar all the time. I also taste things so much more now that I savour my food.
We are here to offer support and tips to help you go forward with this new, healthier lifestyle.