I have to agree with ChiGal.. Vertigo is awful, I can't walk without holding onto the wall because my balance is so off, and everything feels and looks like it's literally spinning all the time. Mine comes on from inner ear issues (usually allergy related) and antihistamines help me.

It does sound to me like it's anxiety to be honest given when it hits, and how it's responded to finding out the blood sugar stuff, or like ChiGal said.. quite possibly dehydration!