Upvoted, this "is it". When I was down, I went to timeboxing and it worked wonders. I changed a little bit how I do it: I allocate to each task just a little less time than I expect it to finish (for example, doing the dishes in 7 minutes instead of 10). Then I have a pressure to finish that seems to motivate me. I wrote about that in my blot (Google for timeboxing mostlymaths if you'd like to read it ;)

Give it a try, it can make a real difference.