Thanks for replying to all of my questions :)
I just wanted to be sure to not keep talking about blood sugar if it's an unlikely explanation, which seems to be the case here.
It sounds pretty scary and unsettling to experience that.
You say you're not sure what sort of MH issues you have, are you currently seeing anyone for how you are doing mentally? Maybe you can mention this incident to them, I've had anxiety attacks with similar symptoms as you describe, and a professional would be able to evaluate whether this needs further looking into.