Hi and welcome
Are you sure you are on the slow release version of Metformin? I understood that it was a larger dose tablet that was taken just once a day but I may be mistaken about that. Are you getting side effects with it and if so, do you take it with food, as that is really important with Metformin and not just a snack but eat something reasonably substantial, take the tablet and eat a bit more...ie take it mid meal.
What is your most recent HbA1c reading. That gives us an indication of where you are on the diabetes scale and how radical you need to be with your diet. I had to be very dramatic about cutting down on carbs as I had sudden onset symptoms and a rather high HbA1c of 112, which people here explained was very dangerous. Despite my best efforts at following the dietary advice I was given my the nurse for 5 weeks and feeling like I was eating cardboard, my food was so bland, my reading had gone up instead of down. It was right at that point that a member here explained that I needed to cut out things like my breakfast porridge and bread and pasta (even wholemeal), rice, potatoes etc. That was the point at which my BG started to drop towards the normal range. It takes some getting your head around when you have been used to eating a high proportion of carbs with every meal, all your life, but it is not only doable but enjoyable once you get the hang of it. Having low carb treats is really important and increasing your fat intake, so that you do not feel deprived. It is necessary to re-educate your palette but you have to be open to that and it doesn't take long to achieve that. I have always drunk my coffee with 2+ sugars or sweeteners and I am currently learning to drink it with just cream and no sweetness. The cream is important because it takes the bitterness off the coffee but it also feels like you are spoiling yourself rather than being deprived. Same with veg. Cook your cabbage in a little butter or bacon fat or add cream cheese and stir it in when it is cooked. Same with spinach and kale. Have cheese on your cauliflower etc.
As regards baking, experiment with other sweeteners like Stevia and use half ground almonds instead of flour and wholemeal spelt flour instead of white flour. You binge because you feel deprived. If you have the odd healthier treat, you learn not to binge.....I can tell you that there was no-one more addicted to sugar than me and I stopped pretty much overnight and I don't even really miss it that much. In fact I feel that I taste food better and savour things like the odd banana that I have chopped up with creamy Greek yoghurt and cream (the fats in the dairy slow down the absorption of the sugars from the banana into your blood stream) far more than I ever enjoyed bananas before. I had an apple for the first time in months the other day. Cut it in half and had half in the morning and the other half in the afternoon and it was gorgeous.... when I was eating masses of chocolate and sweets etc, I would not really have thanked you for an apple or eaten it and barely registered it.
You do need to tackle this problem for the sake of your health and your family and retrain yourself, but once you get the hang of it, I hope like me you will see it as a positive.
If the baking is proving to be too much of a temptation and you are not keen to experiment with lower carb recipes, then it might be best to have a break from it and find some other way to treat your family, at least for a month or two whilst you get into a new routine with food.
As an example, I start the day with a mushroom omelette or a cooked breakfast or this morning I had antipasti consisting of salami and Serrano ham and olives and cheese with my coffee and cream. Or try some natural creamy Greek yoghurt (Lidl Milbona is the lowest carb I have found, comes in a 1Kg pot and tastes lovely) with berries... raspberries are in season now and one of the best fruits for diabetics. Treats are a chunk of cheese, nuts (I love brazils and they are one of the lowest in carbs and Lidl do big bags of nuts quite cheaply), olives, pickled gherkins, the odd square of dark choc 70%+, celery and sweet peppers and raw mushrooms with a sour cream and chive dip. Salads taste so much better with some avocado and creamy cheese coleslaw is not too bad for carbs. If I have an omelette and salad for breakfast, I tend to just have a chunk of cheese for lunch or some nuts and then a dinner of meat or fish (it is salmon tonight) and veg with a couple of potatoes. Desert is usually plain Greek yoghurt and berries
I hope I have given you some "food for thought" as a way forward. We are all in the same boat here. It is not easy in the beginning so you need to set yourself a period of a couple of months of "Me Time" to get your head around it and not baking during that time would make it a lot easier in my opinion. I am sure your family would rather have you healthy, no matter how gorgeous your baking is and in the long run those cakes could contribute to them becoming diabetic in the future too, especially as there is a genetic element to it. A lower carb diet should be beneficial for pretty much everyone.
Good luck. We are here to support you