radiance,
I feel with you, but you've been where I'm still trying to end up so I kinda feel stupid to give you hints on how to get back there. Maybe something of the stuff I found/decided for myself might work. I guess i'm mostly with nolus' post ...
* reduce the setup: I'm limitting myself to Live and Reason, strictly avoiding plugin orgies that'll get me distracted. If my song is shit (harmonies, arrangement), then even a $1000 Waves Compressor won't save it. So I don't even bother.
* play and don't be afraid of trashy ideas and recording methods. One of the best ideas I had happened when I was playing that crappy nylon string guitar on my girlfriends sofa. Wasn't even tuned properly. Recorded it through my iBooks internal mic while my girlfriend was sorting through books in the background, causing lots of weird ambient noise. Warped everything in Live and nailed it to a beat. Threw a loop, a vocal sample and an effect at it and the result is a beautiful triphoppy song fragment thats worth keeping in its original state.
* play even more and enjoy the immediate feedback and results instead of limitting yourself to mousing stuff.If you don't play an instrument, play the automation, clip triggering, cross fading, whatever. Just don't think too much about it. do it. Spend less time in programming drum loops and custom sounds. Use some loops, synth presets and get the basics down. polish later. (thats something I have to remind myself of :/ ... a lot!)
* collaborate and use dealines. do all this in a kamikaze style.
Two days ago I had a few too many beers with two guys from work. At 9pm after a long day I decided we needed to record a hiphip tune RIGHT NOW. Went to my place, got even more drunk. The song didn'T work out at all but we had a lot of fun. I got my acoustic guitar out in the end, we got even drunkenerer and improvised songs any lyrics. We didn't record anything, but it all the anxiety was gone and all the fun was back.
On another occasion I made a deal after a long discussion with a graphic designer coleague of mine. He committed to finishing a 3D model in 7 days, I promised to write a drum'n'bass tune. If you stick to this, it'll make you feel pretty stupid when you waste a whole evening on recreating a 4 bar drum loop that turns out WORSE in the end instead of pushing on with the arrangement and flow of the song. Worked out for me. Its rough, but it was done in 3 or 4 evenings and contains lots of good ideas, samples from a zombie movie and 3 games.
* and if all of the above doesn't work out, I've still got my coverband, so the music making in my daily life doesn't drop under a certain level, even if I'm completely burnt out and scared shitless by this blank live session view staring back at me. It all comes back eventually

have fun (that was an order).