Everyone gets them... when you just don't feel like playing, or everything you play feels or sounds the same... That feeling that you lost something. How does everyone deal with this?
I know when I get it, I try to listen to some music that I never usually do, or just jam with some stuff that I never do. I try to learn something new as well, usually from a Guitar World magazine column or online column. Even if it's just a little riff or a new piece of a scale. Something fresh to kick around... (The Guitar Grimoire works really well too).
If all else fails... I buy new gear. That seems to be the fix-all for every ailment.