Good days and bad days

As a freelance writer, I have my good days and my bad days: Some days I am extremely productive, and other days I can't seem to get anything done, for whatever reason.

Unfortunately, this week has been the later so far.

I was doing great, I really was. I have been quite busy, so I drew up a daily schedule to help myself stay focused. I've been getting up early (i.e. 7am) with Michael for the last three or four weeks, and the earlier schedule has enabled me to add several work hours to my day.

Nevertheless, this week feels like it's been on fast forward -- the days have seemed to go twice as fast as usual, because I can't seem to get done all the things I normally would. And then yesterday, I had cramps and some minor body aches, but basically it kept me from getting comfortable enough to stay in the same place longer than about a half an hour at a time -- and getting up every half an hour is not conducive to a productive day.

What about you? Do you have good days and bad days? What typically constitutes a good day (or a bad day) for you?