During the incident you will experience an adrenaline rush, after the incident you should notice these things returning to normal:

Glucose levels return to normal

Breathing slows, becomes deeper

The heart slows down

Blood is once again directed to the digestive system

Muscles relax

Sweating stops

Pupils of the eyes return to normal

After the incident you may also experience these affects:

Symptoms of shock

Feelings of depression

Feeling elation/hyped up

Anti climax/confusion

Headache

Tiredness

Nausea

Crying

Questioning or going over the incident