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This state may be quickly followed by either further withdrawal from the surrounding situation to the extent of a stupor, or by agitation and overactivity, anxiety, impaired judgement, confusion, and detachment. Autonomic signs of panic anxiety tachycardia, sweating, flushing are also commonly present

The symptoms usually appear within minutes of the impact of the stressful stimulus or event, and disappear within 2–3 days often within hours. Partial or complete amnesia for the episode may be present.

Common symptoms that sufferers of acute stress disorder experience are: detachment; derealization; depersonalization or amnesia; continued re-experiencing of the event by such ways as thoughts, dreams, and flashbacks; and avoidance of any stimulation that reminds them of the event. During this time, they must have symptoms of anxiety, and significant impairment in at least one essential area of functioning

 In addition, the symptoms show a mixed and usually changing picture; in addition to the initial state of "daze", , anxiety, anger, overactivity, and withdrawal may all be seen,  


Creamer et al. did however find that re-experiences of the traumatic event and arousal were better predictors of PTSD. 
therapy which included exposure and cognitive restructuring was found to be effective in preventing PTSD in patients diagnosed with ASD. A combination of relaxation, cognitive restructuring, imaginal exposure, and in vivo exposure was superior to supportive counselling


12.28, 21.11.12,  Wiki