Why is this....

I've been binge eating since last year & I've learned a lot about myself during this time frame. I've gained two stone & im still healthy and active & if im being honest, im actually a lot happier. I've let go of my food rules & have allowed myself to eat whatever, and I have actually started to binge eat less, but the one thing I've noticed is.... I can have let's say - coffee with sugar and milk, lucozade and not even binge (i actually feel satisfied) but if I eat any grains, cheese, or chocolate i get this overwhelmed urge to binge & it's game over. I have tried to allow myself them foods, but every time, it's just a bad ending. Why is it them foods trigger me, but other sugar stuff isn't making me binge?