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Your vocal cords are located in an upper part of the airway called the voice box (larynx). A vocal cord spasm limits the flow of air through the larynx. The cause of laryngospasm is often not known, but certain conditions may be contributing factors or triggers: Gastroesophageal reflux disease (GERD), a condition in which acid from the stomach backs up into the food pipe (esophagus)
I believe laryngospasm is a normal response to prevent drowning or keeping fluid out of the lungs. If you truly were drowning, this is a great functional reflux. That clamping shut of the vocal cords may save your lungs from a bath and long enough for you to get back to the surface. At other times though, it can be quite a nuisance. My suspicion is that you become more susceptible to laryngospasm after an injury to the nerves of the voice box.