I know it sounds crazy! But to use some kind of analogy...imagine the binge food as a big scary dog that lives in your house...its on your mind a lot, you try all you can to avoid it, but often you just can't and you hate it when you are in the same room and then you sort of lose the plot...it's sort of stopping being scared of that dog. Staying calm, breathing, letting it closer, little by little so that gradually you become less scared, you can stroke it, let him lick your hand, then walk away happily, not traumatised....you realise that it isn't vicious, just over friendly....
By being curious about the way you are feeling when you binge, by eating slowly and mindfully you will (gradually) diminish the food's power. By not checking out mentally and dumping an entire pack of biscuits into your tummy in one go you will learn to recognise when you have eaten enough and naturally stop (so you will probably eat less than you think, but yes, the first few times, you may eat til you feel sick but it's a process and the more you slow down, taste the food and practice, the more you will recognise how you feel). By giving yourself permission to binge, making it 'right', acknowledging it is a coping mechanism for you and not something you should fight...you also remove the horrible feelings of guilt that follow.
Right now, before you have had any help/therapy, trying and having any expectation of successfully fighting your urge to binge for a whole week at your mum's, especially given the circumstances, sounds unrealistic to me. And you sound very stressed about it all. So compromise, take control, decide that there is one binge available each day if you need it, so you can relax slightly, know that you have the choice, the food isn't controlling you by being 'banned'. Have plenty of healthier, filling choices available to snack on too, if you want ideas just shout
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Beyond this you can start working on allowing yourself to feel and express the emotions you may be suppressing, or deal with the deeper issues that may be underlying your whole relationship with food and body and learn a healthier way of eating....but as I said, hopefully your therapist will do that deeper work with you. Part of that will no doubt involve telling your wider family about the issue but that's obviously hard right now. Here, I am trying to help you over the next couple of weeks, which sound as if they will be tough
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