Sounds familiar, I had the same thing 2 years ago. I cant remember how I dealt with it, though. Just try to remeber what you most love about playing the guitar. Another think you might think of is that it does not make much sense to leave something you have done for 5+ years, so you should probably just wait for this phase to go away and even sometimes force yourself to play for half an hour or so and I bet you'll soon get your excitement back.