Welcome to the forum if this is your first visit post diagnosis.
Firstly it is good that your c peptide is normal. If you can reverse your insulin resistance (cells becoming deaf to the insulin signal when the body tries to deliver energy (glucose) to the cell) then I'd hope you would be able to come off insulin. You've been offered meds that help your body produce insulin in a more effective way but diet is likely to be the most effective way to reduce your need for meds so its worth looking here for ideas. Many people suggest a low carb approach but there are various different ways to get started on improving our diet.
Ketosis to a dangerous level is rare for a type 2. I am type 1 and it can happen if my blood glucose rises to pathological levels (above 6) because my body can't use the energy I am eating and as alternative fuel is making its own energy from my liver - ketones.
At a high level these ketones are toxic and lead to ketoacidosis which can be fatal. You can be in nutritional ketoses if you eat much less carbohydrate but this isn't pathological. and is actually beneficial if you are trying to reverse type 2 diabetes.
You might have had high blood sugars and have had higher than normal ketones without this being dangerous i.e. ketoacidosis. Normal symptoms of ketoacidosis are pretty extreme e.g. shortness of breath, extreme vomiting and urination, excessive thirst but can't keep fluids down.
Have you been given test strips for this. You can get blood ones or more likely, urine testing strips.