Hi Kiwi man,
I haven't posted on here for a long time.....but the fact that you're a Kiwi got me motivated! I'm a Kiwi too! Not many of us on here! I'm in Taupo.
In response to your question....I;m afraid I don't have much to add. I am one of those in limbo....many neuro symptoms???ms. I am currently undergoing some tests for stomach/bowel issues....potentially Irritable Bowel Syndrome. Like others have said there's a heap of info out there contecting the two.
Definately get checked out, nausea is hideous for anyone to deal with, regardless of the cause. You deserve some relief from it!