For me, it was wave upon wave of intense crushing pressure, it literally knocked me over onto my side all while my vision rotated like a windmill. And as it rotated it made everything look like the Super Mario Brothers video game, especially colors and forms of the background of the game. Also, as these waves of force kept rolling over me I had the feeling like my existence was being ripped away. I was leaving, non-existing, I experienced my own non-existence, almost. Then I was at the foot of the driveway of the house I grew up in, standing there looking up at the house. And there was a whisper in the back of my mind, that gave me some advice. Then I was back. The pressure waves kept coming, but lessened each time they rolled over. I needed to chill out by myself for a little while after that. For me, it was intense.