Your body has been losing calories through exercise and the quickest response it has is to get energy immediately in the form of alot of carbohydrate rich foods. And junk foods tend to have that, especially the sugar form.

If you can manage it, try to get some protein in you before working out. This way your blood sugars will remain stable and it provides longer lasting energy supplies to the body during the workout. It should hopefully relieve some of the urges in binge on junk food.

Also, I'd try to force yourself to eat healthy things when you get the urges. And then, after a normal amount, sit with the feeling. It will take about 30 minutes for your brain to process it is full. If you are still hungry after 30 minutes you can eat something else healthy again.

One of the best advise I can give is Dr. Phil McGraw's book titled the
"Ultimate Weight Solution, The 7 keys". It did wonders for me. I would recommend it to anyone with ED because it teaches how to reduce over loaded emotions that build up causing the compulsions to binge. It also teaches how to break unhealthy food cravings. It gives healthy ways of eating and how to not allow external forces to cause you to binge, like,,, food commercials, driving by fast food restaurants, how to immediately remove the thoughts what negative people say, negative things you see, that kind of thing.

I agree with BeccBecc 100 %.

i understand how easy it is to lose control x you need to choose a set snack or meal for after exercise - choose something that will benefit your body after exercise. i find something like a tuna + salad sandwich or peanut butter + banana on toast (they both provide carbs, veg/fruit + protein)
always here if you need to talk x

I also agree with Becc.

A suggestion, try eating fruits. They have a lot of natural sugar and will boost your energy fairly quickly. Also, they are healthy.