This should help you. Doesn't matter what size you are, as long as your eating is out of control and is harming you psychologically. And at least for me, binge eating has a lot to do with insecurity, so your mind makes you think that food will make you feel better so it starts to tell you you're hungry when really you're just not comfortable with yourself.

You should look into having a session with a good therapist so they can talk with you on how you feel and how to get over the feeling that come up when you're about to binge.

Good Luck