Not feeling it

I'm not sure why, but I just wasn't feeling it today. I went down to do the WOD from yesterday:
Complete three rounds for time of:
Run 800m
155 pound Power cleans, 21 reps

However, when I got down there, there were 2 people on the treadmill and the third was out of service.
Instead of my 800m warm-up jog, I decided to do the row - which I sometimes end up going overboard on. This was just the case today:

1000m row - 3:43.4 - way too fast for a warm-up, which I should probably slow down to as much as 4 minutes or more. After this I did:
5 very wide grip dead-hang full range of motion pull-ups, coming to a complete 2-5 seconds stop at the bottom
20 sit-ups
20 push-ups
20 squats
10 dips
3x 135# power cleans to get the feel of the exercise of the day.

I had planned on doing something else - perhaps some heavy lifts today, but by the time I got to my dips, one of the treadmills was clearing out - so I had a spot to do my 800m run - so I decided to proceed with the WOD.

So I set up 155# on the bar and jumped on the treadmill and started my watch. I could feel at the beginning of the workout that I was less than 100%. It could have been the row being too much, or the fact that it was 3:45 and I had only had a small bowl of cereal, an english muffin, an activia yogurt, a banana and a protein shake for nutrients so far today causing low blood sugar - but either way, I just wasn't feeling it.

I kicked the treadmill up to 10.1 MPH for a just-under-3-minute 800 - of course, with the treadmill getting up to speed, it ended up taking me 3:04. Perhaps this was my second mistake (or third, if you count barely eating any calories) - as when I finished, I had to take a short break before starting the power cleans - and when I did, I only knocked out 5 before stopping. It didn't get any better from there either. Going on 10 minutes after finishing my 800 - and perhaps another 5-6 sets of power cleans, I was finally finishing set 1 at 13:10. I knew I had done something wrong, as other people on the forums had posted between 15 and 30 minutes - at this pace I was looking at not possibly finishing before 40.

I decided to stop - not completely, I ended up racking the bar and doing another 21 reps of bench press at 155# (this only took me 2 sets - 1 of 15 and 1 of 6).

This isn't the only time recently I just "haven't felt it" and had a hard time getting through the workouts. I'm wonder if it really is because of my eating schedule, or if I'm hitting a proverbial wall. Perhaps a change in diet?

Granted, my regular schedule was knocked out of whack - going to bed at the same time as usual (perhaps even a little later), I was up at least an hour earlier than usual - eating a full 1-1.5 hours earlier than usual (at 6:30 AM I had my small cereal) - started the day with a large coffee instead of a large glass of water, had little to drink throughout the day and also little food. I'm also coming off the holiday binge which isn't good - so who knows, perhaps I'll bounce back. Either way, I'll make note of what I am eating/drinking and what kind of sleep I'm getting as I post my near future workouts.