Jess,
Even though I'm a new guy here, I've been playing many years. In all honesty, for me, when I'm in a rut, sometimes I just put the guitar down and walk away. Don't pick it up for a few days or a week. Give your mind a breather. In essence, you can still practice. Practice by LISTENING. Put some of you favorite CD's in, put on some headphones and listen. Listen to your old favorites and listen for things you've never heard before, or things you've heard but didn't pay much attention to. Listen to some of Joe's licks and analyze them in your head. Picture in your head how he may be playing them. Maybe you'll hear a lick that will inspire you to pick up the guitar again to master the lick.
The best way out of a rut is to stop trying to force yourself out. Sometimes, the harder you try, the worse it gets. Take a breather and enjoy the music you hear. You'll be out in no time....
Just my .02........
Keep the faith................
Joe's idea of buying a new guitar never hurts either!