As I accurately predicted, you were chasing magic cures instead of looking at the big picture.
Now you are onto yet another magic cure called nitric oxide, yes I've looked into that one as well.
I'm sorry you're still suffering, but what you need to do is get real and start doing the real foundational work of diet and cleansing, and then you can get a proper handle on your prediabetes.
Pretend you don't know anything (not much of a stretch) and start with the basic curezone cleanses: liver, bowel, kidney, parasites.
And most importantly you need to find a good diet that will support the body in its natural inclination toward self-correction.
HINT: excess meat is not the way to go.
The people who have the most trouble with fruits are the most toxic and the ones who need it most.
At least you're honest about your condition though, unlike your friends who are yapping away about magic cures at the same time oozing sores are popping up on their limbs. So I give you credit for that.
Get your Amalgams removed by an excellent dentist and then you can start from square one with your intestines.
Chromium and vanadium for pancreas support, and a series of Liver Cleanses will hopefully halt your diabetes, and then you can start eating human food aka carbohydrates.