When Ego death is experienced you don't have a perception of self. It is as if you merge into eternity, the boundaries that separate you from everything else break apart and the self becomes the everything. Many people literally feel as if they are dying and it can indeed cause intense fear and panic especially if you fight it. If you just let it happen it causes the most intense euphoria imaginable, not like a dopamine rush euphoria but the euphoria that comes from knowing you cannot possibly have any problems or fears because there is literally no you to be having them. I read this poem in username poems thread and I think it is a perfect description of ego death: