What is nonsyncope nonvertigo?

Nonsyncope nonvertigo is an uncommon vestibular syndrome consisting of episodes of intense fear, pallor, diaphoresis, nausea, retching, and abdominal sensations, not infrequently leading to vomiting, diarrhea, syncope or near-syncope and even convulsions, all in the absence of true dizziness or syncope, in other words, nonepileptic attacks similar to panic attacks