No Willpower

I’m struggling with willpower at the moment. I already broke down with the eating today, and now I’m trying to motivate myself to do my workout tonight. I have a headache, and the last thing I want to do is do my scheduled hour long, intense workout. The dialogue is running in my head… “Oh tomorrow is your rest day, just rest tonight, and do your workout tomorrow.”
That might very well be a viable option if the headache gets any worse, but that’s a slippery slope. I don’t know… I just know I don’t want to do it tonight. I want to go to bed, or at least curl up on the couch with my blanket. I certainly don’t want to do a very challenging workout.