Long-illness patients benefit from lessons learned after COVID

Post-viral long illness patients are benefiting from what doctors have learned from treating long-COVID patients.
Published: Sep. 9, 2025 at 4:17 AM PDT

(InvestigateTV) — For years, Johnalynn Sinnott was a medical mystery, trapped in a cycle of debilitating illness that no one could explain.

It began when she was just 12 years old, when a simple case of the flu morphed into a month-long migraine. That was the start of a painful odyssey filled with countless doctor’s visits, ER trips, MRIs, and blood tests, none of which provided any answers or relief.

Her life was derailed. Her perfect attendance and straight A’s vanished, and instead were replaced by visits from truancy officers.

Worse than the physical pain was the psychological toll of being disbelieved.

“Multiple doctors, after tests came up negative or whatnot, just were like, ‘Well, you’re making it up,’” Sinnott recalls. “Some people just are that straight, like you’re making it up.”

She was scared, angry, and frustrated, suffering from an invisible illness in a medical system that seemed unwilling to see her.

Her story, it turns out, is not unique. She is one of countless patients who have suffered for years from post-viral syndromes, where the body fails to fully recover from an infection like the flu, leaving a constellation of chronic symptoms like brain fog, fatigue, and pain.

For decades, these patients were often misdiagnosed or dismissed. But a breakthrough came from an unexpected source: the COVID-19 pandemic.

Read more of Johnalynn Sinnott’s story from Investigator Jen Picciano.

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