Having anxiety, it can manifest itself in the same way as hypo/hyperglycemia, extreme agitation, paranoia, confusion, delirium, faintness and tachycardia. I get my BGL tested quite regularly, but as yet its usually around the 4 to 8 range depending on whether I've been tested in the morning or after eating which is in within the bounds of being perfectly normal.
I should probably note that at this point I have age on my side, but who knows what will happen in the next 10 years. It does make me wonder though sometimes, when all my stats are normal why I feel like complete and utter crap.
You have to love the way the human body works. Sometimes I wish I was a diabetic so I had a simple answer for why my body does what it does rather than something that has no easy fix with medication.