Can I ask a few questions? I don't know what NFLD is (I keep ending up on Newfoundland when I google it, and I doubt you have a Canadian province). Sorry for being dim. As for your blood sugars always having been on the low side, how would you notice that? Did you test, were there dizzy spells etc? Because there is such a thing as reactive hypoglycemia, and that can be linked to later development of (pre-) diabetes. With RH you overproduce insulin. With T2 you're insensitive you the insulin you make, and you make lots of you've reached that point, so they're kind of related. Sickness and pain would increase bloodsugars, as do some medications, like steroids and statins, so.... What you really want to do is test regularly throughout the day. Fasting, before a meal, 2 hours after the first bite, maybe another one before bed... That's a whole lot of finger pricking, but it would let you know how you're doing before the tolerance test. (You'll also want to write down what the meals were.).
Low carb can up the morning blood sugars too:
https://blog.designsforhealth.com/node/835
So really, just going by your fasting blood sugars doesn't tell you anything right now. You want to know how you respond to food.
Good luck!
Jo