How do i know if i could have anxiety? what are the beginning symptoms? i think i had an attack once..

Anxiety: Common symptoms: chronic worry for no apparent reason, overwhelming fear of a stimulus or situation, agitation, nervousness, or thoughts of dread accompanied by physical symptoms (sweating, high heart rate, flushing, panic). Important to determine if symptoms affect functioning in multiple domains (school, social activities, etc). Be sure to discuss with parent or family, as well as your doctor.