Positives

• Patients stuck in fight-or-flight mode sometimes turn to vagal-toning exercises such as humming, gargling, cold-water exposure, slow breathing, or singing as part of a broader nervous-system calming routine Reddit.

Negatives

• The same recovery-style story still included persistent PEM vulnerability, setbacks, SIBO flares, and symptoms that needed many other interventions, so vagal-toning work may be supportive without solving the whole illness Reddit.

Hurdles & Side Effects

• Patients often need to pick between gentle exercises, humming, breathing drills, or apps that guide them, and the right dose may be very small when the nervous system is easily overstimulated Reddit.