Great comment and matches my experience exactly. I suffered from inexplicable nausea similar to the author for years, not realizing the stress of my work was causing it. Ran all the same tests as the author, had similar experiences with doctors. Was dismissive about stress as a potential factor. Only when I had a “large life change” like you described — a sabbatical in my case - did things get better.

Completely changed my perspective on how stress can physically affect a person.