Research “ego death” for more insight. It can be quite terrifying and “ego” is another term used socially as a kind if watered-down “full of one’s self”. That is just part of the definition. It is the experience of yourself in your reality. And when that fabric of your reality experience starts to unravel it is intense. A lot of people say you are never the same person again after ego death. Similar, just altered in a way. That is somewhat embraced in drug culture though.