Hi. I know lots of tricks on how to eat a lot of food without too many calories. Sometimes you just need to have that full and satisified feeling in order to feel normal and healthy.
Be open to trying new things.
One thing that helps me is eating winter squash. It's in season right now. You can literally eat bowl fulls of the stuff (including canned pumpkin) for very few calories. For lunch you can eat half a head of lettuce and then a tuna sandwich.
Or you can eat a bag full of steamed carrots, broccoli, and cauliflower.
Oatmeal is a great choice. 2 servings of oatmeal (about a cup dry) make a big bowl of oatmeal prepared and you can eat all of that and feel pretty full (Switch out regular milk for 30 calorie almond milk and you can use artifical sweetener to sweeten it). 2 servings of Quaker old fashioned oats have 300 calories. And it does make a big, hearty bowl.
Try to eat protein with every meal. Eggs can help as a low calorie source. If you can learn to like meat substitues then Quorn or Boca burgers can give you some meaty foods with lower calories than actual meat. 98% fat free hot dogs are a good substitute for full fat ones once you get used to them.
The trick is often to find foods you like and then find lower calorie substitutes for them.
If you're tempted to binge, then plan a cheat meal every week, but still try to keep the calories somewhat reasonable on it.
La Choy Chow Mein in the can is low in calories and you can eat the whole thing and feel pretty stuffed. That might not be good for an every day meal because of the high sodium in it but it is tasty and filling and low in calories.
Have a pumpkin pie treat by putting canned pumpkin in a bowl, heating it up, adding a dash of pumpkin pie spice and some sweetener. It tastes great that way.
A cool "mind trick" you can use is to take wax beans (They are yellow versions of green beans) and sprinkle a little parmesan cheese on them for flavor with salt and pepper. It looks like macaroni and cheese, and it kind of tastes like it, so you can feel like you're eating it without all the calories.
Also you can take a can of mixed vegetables and add them to a can of low calorie soup like progresso to bulk it up and make it filling. This creates a big bowl of soup for very few added calories and can really fill you up!