dear, panic attacks have abrupt onset. there is sudden apprehensive feeling, intense anxiety associated with sweating, nausea, breathlessness, dizziness,etc it can be without any cause or often when response to a particular event or peculiar circumstances. often last for few minutes. tab propranolo 20 mg sos tab alprazolam 0.25 mg sos whenver you anticipate an attack is the treatment of choice. psychotherapy like graded exposure and washing out techniques are effective. i would advice to show yourself to a local psychiatrist. do not worry a minor problem it it. hope to have solve your query. thanks regards dr pankaj