So perhaps just let it be a mystery?
It could have been a spontaneous gift of Grace given to you because God knew it would be good for you. It could have been a random neuron misfire. It could have been many things. I think the point is that even if there is anyone on this forum qualified to make such a judgment (and I'm certainly not one of them), they wouldn't be able to do so through some sort of anonymous discussion on the internet. What you described does have possible correlates in Orthodoxy. But the exploration of what it actually was is something that should be undertaken in the context of a personal relationship with a spiritual father. If you have a parish priest, discuss it with him. If that is not possible for you at this time, then, yes, probably best to just 'let it be a mystery' until you are in a position to discuss it fully with a confessor.