What helped me in your situation was getting "out" a bit more, if only to walk around the block. Go to the library or other public places and just hang out a bit, around other people? I keep thinking I might want to take my laptop to the library and work since my county has internet access in all the branches near me.

Maybe come up with a little, "interesting" challenge for yourself; walk around the block every evening at exactly 8:30 and then record your "best" thought in that 15-30 minute period? Something like that. For awhile I was using my camera and taking one picture a day that best illustrated that day? Getting out and "seeing" things and getting fresh air can only help your writing.

Do you know Julia Cameron's The Artist's Way http://www.theartistsway.com/

It literally changed my life regarding writing, got me all re-enthused and creative, etc.