I think the guilt can swing you two ways. One way it can make you give it all up and label yourself a failure, or you can use it to make a note of how you feel, then move on.
I don't think you would have done much damage to be honest, but I think its the guilt feeling that can cause the problems. Its so hard in the beginning, and when you feel hungry its near impossible to think you would ever not feel hungry when the ketosis kicks in. I just wrote a 'help me' post because i was near to giving in (and i'm only on day 2!!). I managed lipotrim last year for 6 weeks and had to refeed in between due to the snow and it didnt make much difference to my weight loss. But it knocked my willpower for six. In my eyes I had 'given myself permission' to eat, and for me thats just like saying...give up and eat!
But I wouldnt worry too much, put it behind you and carry on...it could have been a whole lot worse!!
Good luck xx