Small goals might help. Go for one day binge free and drink lots of water. Re measure after a couple good days of no binging. I find that my belly bloat goes down so fast once I commit to eating normal. I have not binged for three days in a row after a long streak of binge days and I can already tell my bloat has decreased a TON. You can do this! You will feel awesome after even one day of healthy foods in healthy amounts!

Good exercise for waist is to get a fairly heavy dumbbell, hold in one hand and lean over to the side with it, back up, and repeat for 50 times each side. I do that 3 times a week. It also works your abdominal muscles at the same time. I use a 10kg weight. But the best thing, ideally, is to avoid too many refined carbs, eat a lot of vegetables, drink plenty of water and just allow a treat if and when you fancy it, but in moderation. For example, if you are out and fancy something, have it, as it is better than an all out binge in the end. It is essential that even if you do binge, you try and still workout as that does make a difference.