Welcome to NeuroTalk.

A fasting insulin may show high if you exercise before having it drawn, like briskly walking a long way into the clinic from a parking lot.

Elevated insulin can come from Polycystic Ovary syndrome in females also. So I would pay attention to the high reading.
Sounds like you are modifying your diet some, and that is always good.

If you are using the alpha lipoic, the original mixture one, you need pretty high doses, and it is best to take on an empty stomach.

If you are on a statin drug for cholesterol....you might have to rethink that. They have been shown to elevate blood sugars, and they can cause PN.

This is a good place to discuss things...so jump right in when you need to.