Why is it so hard sometimes?

So I was asked yesterday to make my famous homemade mac n' cheese for a family in our church.  I put it together yesterday and then this afternoon had the kids put it in the oven for me.  Boy did the house smell good when I got home.  I pulled the baked mac n' cheese out of the oven and stuck my spoon down in it to make sure it was done and it was perfect.  Then I had to smell it the whole way to church (which for me was about 1 hour).  So I endured that and got through.  Then by the time church let out I was starving so what do I do?  I go to Wendys with some others from church and instead of getting a small chili and a plain baked potato, I got a large chili and plain baked potato.  I was about half way through the chili and already felt full but did I stop?  Noooo!  I just kept eating until it was all gone.  Now I am miserable.  These are the things we are supposed to be practicing now and learning now because after surgery if I do that I will get deathly sick.  I did really good all day and then I ruined it tonight.  I guess it could have been a lot worse.  I could of gotten a big ole juicy hamburger and a large fry but I would be much happier right now if I had only eaten the small chili!  Oh well, nothing I can do now so I just accept it and move on.  Tomorrow is a new day.  I go to my new PCP and I will get to see if I have lost anymore weight since last week.  After this past weekend I would be surprised if I had!  Goodnight all!