snacks for dysautonomia nausea relief charcuterie board Dysautonomia messes with your autonomic nervous system—the bit that's supposed to run automatically in the background. When it goes haywire, nausea shows up for a few key reasons: The Vagus Nerve Connection Your vagus nerve is like the communication highway between your brain and gut. In dysautonomia, this nerve can misfire, sending confusing signals that trigger nausea, bloating, and that delightful "I might vomit any s