Lets look at it another way, when you loose hands, are you loosing the likes of.. example you have trip aces and loose to quad kings or the like? Or is it just bad hands overall?
I go through that alot, (the bad hand part). Ill go through 10 tournaments and sit there and get delt crap hands all night. You have an Xbox or something? Take a break when you're getting bad. I play some Modern Warfare or Resident evil or something. Kill some zombies, eat some energizing food, drink some coffee, go outside for a smoke, etc.
Take a break a day! Get out, call up some friends, if you like partying then go out and drink or whatever and come back.
I heard from someone somewhere once as well, If you fold a 9-3 off suited and 3 nines come out on the flop and everyone goes all in and you loose all that profit, laugh about it and say inside your head, "Yeah and if that didn't come out I would have just lost my blinds and whatever else I invested looking dumb".
To the point, just don't let anything get inside your head, otherwise you've beaten yourself.