Hope you're doing better! Don't give up. I think you should still write about the days you don't do so well. It will be good for you to look back on and keep you in control in the moment since having to write about it will still be on your mind. Even if there are less-than-ideal foods in the house you can still practice getting better at self control, portion control, workout consistency, calorie counting (if you do that), etc. Make the best out of a bad situation.
I'm rooting for you!