One exercise you might want to try is take a six month segment of your writing, and, with a physical (or electronic, if you prefer) calendar, jot down what your word counts for those days were (similar to what you mentioned above). Then you can kind of see a trend of your writing, and understand when you are writing, how much is coming out, and maybe even understand why. Then, you don't use the word counts as a goal, but more as a tool to say "Okay, the reason things are slow is because I'm ALWAYS slow on Sundays, but I usually pick it up on Tuesdays so we're good" and it's less demotivational than looking at it as "OH GOODNESS MY WORD COUNT IS NONEXISTENT!!!!"

If you track back, you can get an idea of what it has been like, but of course, you can just start with now and look forward from here.

I was trying to find a way to tie in what you've been writing about, but my brain says "Haha, try to think when I'm not ready to, will ye?" So no more thoughts. :D