I suggest you read “Varieties of Religious Experience” by the American psychologist William James.
It seems to me that you had this type if experience, one of whose defining characteristics is an inability to explain it in words.
It happened to me once, in a crowded nightclub, of all places. I was stone cold sober.
It was like the tapestry of life was weaving itself. My friend and colleague was speaking to me of serious matters.
And I felt a certainty, a harmony, like music…