If your pancreas failed you are going to know, because you're going to the hospital whether you want to or not. Sudden weight loss, blurry vision, peeing a lot, insatiable thirst are signs before you collapse.
Insulin resistance and a pre-diabetic state when approaching type II diabetes is less dramatic. Buy a glucometer and check your fasted blood glucose. You could also do a glucose tolerance test. The protocols and BG ranges are easy to find with google. But if you're really concerned you should go to the doc.