I have to be honest. The most effective medication for T2 is metformin. On average it can reduce you A1c perhaps 1%. After that, the rest of the medications are less effective. And in the scope of things, the GLP-1 drugs like Betta, Victoza and Bydureon are a good second best, reducing A1c and reducing appetite and weight. The DPP-4 drugs which act in opposite to the GLP-1 drugs while they are oral pills rather than injectible are less effective. These drugs like Januvia, Onglyza, and Tradgenta) are useful but don't expect they will normalize your blood sugar as they tend to be less effective than the GLP-1 drugs.
Since your blood sugar has gotten so high even though you have followed a low carb diet and taken metformin it is quite appropriate to see an endo. You deserve the best. If you need to move to insulin that is ok. If your endo as an expert can find some drugs to help you that is great, but we just need to do what we need to do.