Bourne (2005) describes anxiety this way: "Anxiety affects your whole being. It is a physiological, behavioral, and psychological reaction all at once. On a physiological level, anxiety may include bodily reactions such as rapid heartbeat, muscle tension, queasiness, dry mouth, or sweating. On a behavioral level, it can sabotage your ability to act, express yourself, or deal with everyday situations. Psychologically, anxiety is a subjective state of apprehension and uneasiness. In its most extreme form, it can cause you to feel detached from yourself and even fearful of dying or going crazy."
Article - Tips to reduce anxiety