Heck yeah I lose my fire sometimes!
@indagold @Jessisheron and @AmysGames all had great advice that I follow myself. I did one other thing, too, that I found really helped me a lot.
Basically, I've had the imagery and basic idea for this one comic rattling around in my mind, and growing, since I was about 16 or so, which is 20 years now. I've worked on it on and off that entire time but never gone very far with it. Then I got the idea to get one of my frequent collaborators involved. He's a very dear friend and colleague, and an awesome writer. He loves comics more than almost anything in the world, and one of his only wishes is to work on them throughout his life.
Once I got this man involved in my story, I finally got more serious about it, for two reasons: 1) involving another human meant I had to establish deadlines and a pace, so he can work on it too once I'm done with my bit, and then we work on it in time to have that part done after that. 2) Now that his hopes and dreams are on the line too, I can't let him down! I think he's the best, and I don't won't to disappoint him specifically.
So the above awesome advice you've received (Big buffer for break times, play stuff in background, make sure to at least get a line down on the page and name it), plus involving a peer you really care about, is what pulls me out of it.