Vagus Nerve Stimulator and mental illness

I have done a lot of research on vagus nerve stimulation. It is usually used to treat epilaepsy and depression....but it has also been used for other mental illnesses. Only in the last year have they bought out a non invasive VNS stimulator...which means no implant. Two devices (one for the ear and one for the forehead) haven't been approved in Australia yet. One device has been approved that uses the T nerve in the throat but only approved for cluster headaches to date. This is the pointy end of research in this area. There is a growing body of evidence that it has a lot further implications in regards to some other mental illnesses. I suffer from PD....I have teased out a list of coping mechanisms that I have intuitvly used for years. They could be pschological or vagal related. As a scientist I require good evidence. Correlation doesn't equal causation. Are there any other people out there that have a panic disorder that doesn't follow the same racing heart, palpitations, hyperventalation etc and have felt their panic episodes fall somewhere between an epileptic fit and the more common panic disorders as described in all the text books?