I once drank an entire 2-liter of mountain dew in one sitting... and I think proved it was possible to get high off caffiene.. I couldn't feel pain, I told someone to kick me. so he did.. as hard as he could.. I didn't feel a thing.. though the next day I was like "man why does my leg hurt?" and then I look and saw a huge black and blue bruise (like the size of a basketball).. and I was like "ohhhh yeah...."

this has nothing to do with anything, but you said you couldn't feel pain, and it reminded me of this...