Honestly, I couldn't even stand up. I ran to the bathroom as quickly as i could, I remember throwing up a lot, god the pain was hellish, then I remember I locked myself inside the shower as I had no energy left, I tried to stand up but I quickly fell down, continued doing this for a couple of times and most of the time I hit my head, but since I was already going through a different pain, i didn't feel much pain when I hit my head, later today I felt like my head was in immense pain.
As for the Sn, it is pretty indescribable, it is more like a different sensation altogether, one I can hardly put into words, it is managable if you are sure of what you are trying to do, maybe I wasn't 100% sure? Plus obviously the anxiety kicked in. So, that made me panic too. But the involuentary muscle movement starts in your stomach, hence the throwing up, I don't know what the cure for that is.