@Flair
The condition you have seems to be high insulin and normal blood sugar. You have been on a low carb diet therefore it would seem your BS should be easy to control, but it is not.
Your symptoms are the reverse of someone with diabetes. So it make no sense to treat you like you have diabetes, something else is going on.
I did a google search looking for things besides sugar that would make insulin go high. "hormone stimulate insulin production" and ""insulin release" hormones" and combinations. I found some information but it takes time to comb thru each detail and look up new words. I think you will have to pick up the search for an answer.
My guess is something for some reason is stimulating the pancreas beta cells to produce insulin. It could be artificial sweeteners or growth hormones. Your situation is unusual and out of the capabilities of this forum to solve. We aren't doctors, can't see your medical history, give you blood tests nor properly diagnose your specific condition.
The expert you need to see is an endocrinologist, someone that specializes in the human endocrine system. Most general doctors know the basics and some of the common ailments but yours needs a specialist that knows about unusual conditions.
This forum has experience with common ailments but not yours.
Insulinoma – a tumor of beta cells producing excess insulin or
reactive hypoglycemia.
https://en.wikipedia.org/wiki/Insulinoma
Good Luck