Couple thoughts to add:
Diabetic ketoacidosis is EXTREMELY rare in Type 2. (The medical community might say it "never" happens but "never say never".)
Over time Type 2 diabetics can also loose beta cell function. Depending on the amount of beta cell function lost, insulin is needed. In these circumstances, a person is STILL a type 2 diabetic, they are just a type 2 diabetic requiring insulin.
If the C-peptide doesn't reveal you have Type 1 or 1.5, you may want to think of asking your doctor to rule out Cushing's. It is extremely unlikely because it is quite rare but it is not impossible.
Also see if you can have them check your thyroid and iron levels. If you have iron deficiency that could contribute to fatigue.