Chronic Nausea and Vomiting Syndrome

The goal of this study is to determine whether stimulation of the brain-stomach connection can influence stomach activity in healthy adults and in individuals suffering from chronic nausea. The main questions it aims to answer are: * What are the best brain sites to influence the stomach? * What are the effects of different stimulation patterns on stomach activity? * Does the stimulation affect the sensation of nausea in participants suffering from chronic nausea? Researchers will use a non-invasive method of brain stimulation called Transcranial Magnetic Stimulation (TMS) and will record stomach responses with skin electrodes on the abdomen. Participants will: * Visit the clinic at least once, and for up to 9 times more over the course of several months. * Receive TMS while sitting in a chair similar to a dentist's chair. * Drink water or consume a test meal during each study visit.

The goal of this clinical trial is to learn whether a wearable transcutaneous electrical nerve stimulation (TENS) device called EmeTerm can help reduce nausea in adults who have had nausea for 2 months or longer and who receive care at The Ohio State University. The study will also evaluate whether use of the device affects other symptoms and aspects of wellbeing, including vomiting, abdominal pain, bloating, constipation, appetite, sleep, mood, stress, fatigue, quality of life, and hope. \[34\_Emeterm...rotocol\_v3 \| Word\] The main questions it aims to answer are: Does using the EmeTerm device reduce the average weekly frequency of moderate to severe nausea compared with symptoms during a baseline observation period? \[34\_Emeterm...rotocol\_v3 \| Word\] Does using the EmeTerm device reduce the duration of nausea, frequency of vomiting, and use of anti-nausea medications, and improve other gastrointestinal symptoms, wellbeing, and quality of life? \[34\_Emeterm...rotocol\_v3 \| Word\] This is a single-arm study. Participants will serve as their own comparison by comparing symptoms during device use with symptoms recorded during the baseline period before using the device. \[34\_Emeterm...rotocol\_v3 \| Word\] Participants will: Complete a screening survey and provide electronic informed consent if eligible. \[34\_Emeterm...rotocol\_v3 \| Word\] Complete baseline questionnaires and record daily gastrointestinal symptoms for a 2-week baseline period. \[34\_Emeterm...rotocol\_v3 \| Word\] Receive an EmeTerm wearable TENS device and instructions for its use. \[34\_Emeterm...rotocol\_v3 \| Word\] Use the EmeTerm device for 12 weeks while continuing to record nausea and other gastrointestinal symptoms. \[34\_Emeterm...rotocol\_v3 \| Word\] Complete weekly and monthly surveys about symptoms, stress, sleep, appetite, fatigue, quality of life, anxiety, depression, autonomic symptoms, device experience, and any adverse events.