That you had the above could have been because of a seizure (fits) or heart problem or a number of other conditions that ultimated in changes to the blood supply to your brain. Also chemical changes like Sugar , Oxygen ,carbon dioxide could have accounted for your experience. Blood pressure or changes in your effective blood volume or blood count too could have caused what happened to you.
Your doctor will listen carefully to the how and what occurred to come to a diagnosis. Test may well be reccomended that may include Blood tests, Heart tests and / or even a brain scan or EEG. Hospitalization may even be indicated.
BOTTOM LINE is that prevention of other episodes of altered consciousness would be the goal -as this can be a dangerous occurrence.
You would perhaps have to exercise more care in routine activities like driving , riding , crossing streets or machinery operation.
Eating regularly especially breakfast and drinking more fluids (4-6 glasses ) are generally good reccomendations as is avoidance of extreme heat or cold. Long standing like that of a cadet is not a good idea as the movement of your leg often helps blood to get to the heart. If you sense things are re-occurring it would usually be best to pull over, find a safe area so to sit and put your head between your knees.