Goodness me Bridget, that does sound scary. 
I don't know if your blood sugars were low, but if they were, you must have sugar ASAP.
I am a type 1 diabetic and going low, hypo is very unpleasant and very damaging. Damages the brain.
Eating a couple of nuts/similar is no good. It must be sugar ASAP, to bring back the blood sugar to normal, as quickly as possible.
The longer your blood sugar is low the more brain damage it does, that is why it is recommended Lucozade which is easily drinkable and gets into the blood system very quickly or jellybeans, or glucose tablets.
although please be aware that Lucozade (because of Jamie Olivers stupid stupid tax) has now changed its recipe and has less sugar in it then it used to, which is very good for everybody else, and the obesity crisis, but a nightmare for diabetics.
my diabetic consultant two weeks ago was saying that she is a very unhappy with it, the new lucozade, but that it all comes down to money!!
Maybe you should mention this to your GP? Because it could be something else entirely?