OGTT with Insulin results – who is familiar with interpreting results?

An interesting set of results supporting reactive hypoglycemia. I think your c-peptide is currently normal 80 - 250 pmol/L (at 148? if using pmol/L). However, your phase 1 insulin response to glucose looks below what it should be, which would support why you spiked your blood sugars. See: https://emedicine.medscape.com/article/2089224-overview
Something to ask your specialist anyhow.

Hi and welcome to the forum.
I'm really glad you found a doctor that has the open mind that you can have non diabetic post prandial Hypoglycaemia, reactive hypoglycaemia.
Having had quite a few eOGTTs, I can see why you have been diagnosed though a further fasting test will give you a specific diagnosis.
You are definitely non diabetic, you are getting high spikes from normal levels because for some reason, in my case and probably in yours, after the glucose derived from food or drink, the insulin response is abnormal and not enough for the glucose.
Then because of the high glucose at one hour of your test is near the spike, what is called an overshoot of insulin is triggered, this is why in your test the insulin levels are as high as the glucose spike is, to drive the blood glucose levels down, but again as the high levels of insulin will drive your blood glucose levels down into hypoglycaemia.
Of course, because of the fluctuations in blood glucose levels, this causes many of the symptoms you have experienced.

I have been diagnosed now for over seven years and LCHF has definitely been the only treatment that can guarantee you of having on or around normal blood levels.
Having meals and drinks that are carb and sugar free, is the only treatment to get your health, your life, your well being and control your condition.

There is a lot more than carbs and sugar, I have found that only fresh food can help with control. Certain fats that are considered healthy and some vegetables, vegetable oils and industrial sugars and ingredients can hinder your health. Some other additives are also not recommended.
You will have to accept that what nutritionists and dieticians claim to be healthy complex carbs, will still cause the high glucose. You will have to experiment what foods you decide to eat are healthy for you. The majority of professionals will insist on some carbs, but I found that regardless of how they label them, they will still cause the Hypoglycaemia. I have kept a food diary for many years, this has helped me so much, and testing before and after eating is so important to understand what is going on.
Insulin resistance will be a problem until you get that down through low carb diet, and exercise, which will help but you have to be aware of overdoing it because of a liver dump of glucose will trigger a hypo.

I would definitely recommend reading about reactive hypoglycaemia on our forum, because there is not just reactive hypoglycaemia but other conditions that are very similar in symptoms of RH and diabetes and metabolic conditions.

I'm sure that you have plenty of questions about dietary advice and how to achieve constant blood levels and perhaps as I came to realise that a Keto diet and intermittent fasting is for us RH ers the best treatment.

Keep asking, keep safe.

Best wishes