I always thought it must be symptomatic of an inability to process something rather than producing too much insulin but the description fits. I do hangry very well too.
It’s not that bad unless I forget / get greedy / have just come in from a ride and no crumb will be left uneaten. The holes in donuts are very poor fare in these circumstances.
I am from rustic Eastern Europe peasant stock, I’ll have you know. Possibly for this reason I don’t usually eat many processed foods. So I reckon my digestive system gets a bit of a shock whenever it’s presented with easy access carbs. Yes, morning sugar ingestion of any kind can be quite disastrous.