"Five mass vaccination sites reported 64 anxiety-related events, including 17 events of syncope (fainting) after receipt of [the Johnson & Johnson] COVID-19 vaccine," the report stated. Experts say anxiety-inducing physical reactions are nothing new and have been known for decades. Researchers state these types of reactions can occur after any vaccination...April 7 through April 9...clinics in California, Colorado, Georgia, Iowa and North Carolina.