Yes, obviously feeling unsafe is distressing. *For me*, it's worth sorting out whether the feeling of danger is realistic: e.g., am I sensibly being more cautious than some people about heights without handrails because my balance isn't great, or is the reaction keeping me away from things that I rationally know aren't risky because they do have solid handrails?

It sounds as though the caffeine thing was written by someone who hasn't really grokked that humans vary, in part because human bodies vary.