As you went through hepatorenal failure (dysfunctioning of liver
and kidneys), your nephropathy could just be the beginning of the disease . This seems a more likely cause of nephropathy. Doctors did right thing to put you on Insulin
But one thing is proved that your body is susceptible for developing diabetes
in future. You need to monitor your sugars on regular basis - preferably once every 15 days.
In the future if at all you develop diabetes, you can still be started upon oral tablets if your renal and hepatic functions are normal. Or maybe insulin, depending on the situation.
Wish you good health.