Is there any support groups for former "Demon Soul" players?

I played the game back in 2011, yet to this day I still get nightmares about it. Sometimes I still hear the intro music being played.

Also how do I warn my friend about it? He wants to try out the game "Dark Souls", he says that it's probably nothing and that it looks a lot like Skyrim, his got no idea how brutal this game is.

I used to be a happy cheerful man myself, then I played "Demon Souls."