What is it? People who suffer from anxiety often feel nervous, powerless, having a sense of impending danger or doom with trouble concentrating on anything other than their worry. These feelings can lead to panic attacks in which the body responds physiologically with increased heart rate, rapid breathing (hyperventilation), sweating, trembling, and even digestive upheaval. Eventually this leaves a person feeling weak or tired, often resulting in sleep disturbances (insomnia symptoms) as well.
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