it's happened to me while pregnant and wasn't low blood sugar (it has also happened other times and definitely been low blood sugar).
I've always written it off as just a side effect of pregnancy. Dehydration could definitely be it or stress. I had a couple things that felt like panic attacks while I was pregnant with DD, but I wasn't actually panic'd.
For the OP - does sound like low blood sugar - keep candies in your pocket like an old lady
Yeah, it happens to me when pregnant too. Not low blood sugar usually (though sometimes.) It's just an occasional pregnancy side effect for me.