Futile day...

Its been a long time since I had one of these days. I started a project today morning with a vow that I should complete it by end of the day. It was a super busy day with 2 conference calls and all day work. By 5PM I was still where I started at 7AM in the morning. Absolutely no porgress. I was mentally exhausted and went for an intense 45 minute workout. That was the only high point of the day. Burnt a satisfactory 500 calories with a motivation to burn even more. That was physically exhaustive and mentally refreshing.
I closed shop for the day at 6PM promising myself that I will tackle it again tomorrow morning. Hopefully a fresh mind in the morning will help. Its been a long time since I had started such a project and was not able to complete it. I remember 2 years back, I used to complete 2-3 such projects a day. I have been struggliing with this for the past 2 days with no progress whatsoever. Something is fundamentally wrong. I need to go back to basics.
I see that this is affecting my sleep too. I am so pre-occupied with this that I am not able to get a good night's sleep. I need to put a closure to this. Hopefully tomorrow is a better day.