Hi, PD
I think you are being a bit hard on yourself.
I know it's important to follow the rules of your surgeon, but you could have done a lot more damage to your pre-op diet than half a chicken breast. The important thing is that you realised your mistake before letting it get out of hand. After all, it's because of these mishaps we have, that we all got into this position in the first place of needing wls.
Stay strong x