A troubled or anxious state of mind
Breathing in and out slowly for several moments will reduce his feelings of anxiousness.
Uncontrollable anxiousness that interferes with daily life is clinical anxiety, or generalized anxiety disorder (GAD).
Having a manageable amount of anxiousness can motivate you to think harder on questions.
Most common side effects reported are behavior changes and frenzied activity or anxiousness.
It's even about the people you aren't fond of, which means awkwardness and anxiousness.