How to stop binge eating?

I had anorexia for about 8 years and was really underweight, then went through a traumatic experience and then started using food to cope. I will eat fine during the day but then at night I start eating so much. Like could eat an entire bag of chips. It’s like a cycle, i always tell myself todays the day that I get better and I never do. I’m not overweight but my body has changed so much, I can’t wear anything because I don’t feel good about myself. I just want to lose the 20 lbs I gained but I just haven’t found a way to get over the urge to eat at night. Has anyone been through this, any tips? how do you get over it?