It has been said many times by spiritual teachers that on some deeper level we are all part of the One, and therefore that our feelings of being separated from one another are a necessary illusion for us to be able to learn certain lessons which we could not otherwise.
During your mystical experience the barriers of this illusion were temporarily down, and the truth was revealed to you in all it's simplicity but splendour.
This altered state of consciousness is usually only realised during periods of deep meditation or through the use of certain psychotropic drugs, but for some reason this time it happened to you while you were wide awake.
This experience is therefore something to be cherished and remembered for the rest of your life, as it is uncommon for this to happen more than once (although I am certainly not ruling out the possibility that it just might).
Please read "The Illusion of Separation"
http://www.spiritual-experiences.com/articles-spirituality/illusion-separation.php
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