Honestly, if you are having that hard of a time quitting the game, I think you need to seek professional help for a gaming addiction or to find out what WoW is giving you that real life isn't. I play WoW too but I have never had the feelings you do. I play for a while, get bored and quit, sometimes for a year or more and then come back when there is new content which I play for a while and then quit again.
If you really cannot cancel your account and not play, seek help.