Your hands can shake making you feel quite weak. This is because of the falling blood sugar that was pumped into your system to provide the energy needed for a flight-or-fight survival response
Sometimes with a sudden loss of adrenaline and endorphin rush can result in sudden fainting. This sudden fainting episode is caused by a drop in blood pressure and heart-rate, and should not be confused with the fear response.
The unexpected release of intense emotion that was suppressed during the adrenaline surge, most often this erupts in the form of crying.