The craving for experience is the beginning of illusion. As you now realize, your visions were but the projections of your background, of your conditioning, and it is these projections that you have experienced. Surely this is not meditation. The beginning of meditation is the understanding of the background, of the self, and without this understanding, what is called meditation, however pleasurable or painful, is merely a form of self-hypnosis.
You have practiced self-control, mastered thought, and concentrated on the furthering of experience. This is a self-centered occupation, it is not meditation; and to perceive that it is not meditation is the beginning of meditation. To see the truth in the false sets the mind free from the false. Freedom from the false does not come about through the desire to achieve it; it comes when the mind is no longer concerned with success with the attainment of an end. There must be the cessation of all search, and only then is there a possibility of the coming into being of that which is nameless.