Just because you've eaten somewhat irresponsibily for the past two days does not mean your diet is ruined. By asking this question, you have admitted you realize you aren't eating right. Now, just make it a point to get yourself back on track and go from there. I realize saying this is a lot easier than doing it. You just have to be committed. Commitment is also hard. Take it one day at a time. If you flub up, that's okay - forgive yourself and continue from there.