I feel a binge coming on. HELP!

Here's what has helped me. Tell yourself you can have whatever binge food you are craving tomorrow but not today. This helps me a lot. Because I'm a now or never type. If I'm at a party I used to binge because I knew those specific coveted yum foods will not be available after that day/event. If you can honestly tell yourself the food isn't going away and can be had at a later point it eases your mind away from the panic of "I need to eat all of this right now to feel good". If you fool yourself into believing you will still get it but not this instant it can often give you the time you need to get into a different head space and remember your goals and get yourself back on track without a huge derailment. Worst case you still do eat it tomorrow but at least you proved that your self control is getting stronger.

Know it's going to happen? Start eating crunchy things like carrot sticks and celery. I hate those but forcing myself to eat them reminds me that I'm currently out of control and I force myself to eat 3-6 of each telling myself I can still have the whole batch of cookies but only after the veggies. This does two things, it fills you up with less calorie dense food first so even if the cookies win you will likely eat less since you put something with volume and nutrients in first. Even if you overate by 3,000 calories it's still way better than 5,000.
Often when you eat something, anything really to satisfy hunger it can snap you back into reality and if it happens before the binge you didn't have to eat a pint of ice cream before you realized it, you only ate some crunchy veggies. I say this because I know my binges are usually brought on by true hunger. It's often time to eat already and instead of trying to eat a normal meal first to feel full I would go straight for the crap I was craving. Sometimes I so badly crave chocolate or peanut butter but if I eat my chicken sandwich and grilled peppers first/instead the binge desire goes away, since I was just mistaking normal hunger or being ravenous and out of control. I tell myself I can still have the chocolate later but not now, because now it is time for a healthy meal.

Try to eat something with better nutrition before a binge don't go straight to binge food. Often it will stop the binge, or at least keep you from downing a couple thousand calories of simple carbs and sugar. Eat protein and fat in a regular meal first. No one craves steak on a binge but eating something healthier and filling first will offset the damage when you reach for low volume and high calorie cookies/desserts/ice cream. Or it may even stop the binge! I've had a lot of success with forcing myself to eat a healthy protein filled meal before I lost control. I regained control and have stopped almost entirely with binge eating.

I hope these help!