When we leave our comfort place, there is always a risk to lose our focus. I know from experience, every time I go to see my family, I have to face things that I tend to forget when I am on my own. And of course I have to adapt to their eating habits, which are different than the ones I developped. But as the years go by, you'll get better at this. Don't give up, be in peace with "here and now". Soon you'll be back home, and you'll have time to think about your meal plan and if you want to stick to it or not. try to make good choices, and don't beat yourself up if you fail. We are only human, and we can't be perfect all the time! Take care.