Healthy weight, still binging/relapse?

Hi there 

Have managed to get my weight up to 9 stone 10 at 5 foot 7 and would finally say that I am recovered from anorexia-am loving university and flexible eating at the moment :)
I am eating around 2000 calories a day and no longer obsess around food-I am relaxed around meal times and can eat spontaneously

However I am still binging on chocolate most nights, around 500-1000 calories worth even after a full day of meals :/ this is really scaring me as I'm comfortable with my weight right now and really dont want to gain any more!

Any help/advice-why is this happening to me? 

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