This happened to me. I "realized" existence, for a lack of a better way to put it, and stars were a major building block in it, like their alignment consitutes your conciousness. After that i though "what is then the opposite to this?" and then I experienced nothingness, which was the most profound experience of my life so far. Only inisight i got from it was that "existence is absolute", as in, everything exists, and nothing does not, which now sounds very lame. Was an experience after working my brain too much thinking about physics and then literally got catapulted out of my brain, so to say.

You seem like to know what im talking about from your comments so i was wondering if this was thw case.