Side Effects?

A few hours after I had my VNS turned on, my throat & mouth started to feel... hmmm... I can best describe it as "parched"... a feeling that I just haven't had enough to drink and need to get a little something to sip on... it does not go away either. Some people have described similar side effects, but only when the device is on. If anyone with a VNS is visiting, I would be interested to know if this is a common side effect, or just my imagination.