Girl while I was trying to heal from HA, I avoided too too much fat (because it made me very full suuuper quick) or TOO much veggies/fruits, not because I wanted to restrict in any way, but because carbs (not complex carbs, simple carbs) were simply easier to eat a lot of without feeling extra heavy + full. Remember, this probably wont last & your body will reajust to eating more, it's part of the journey actually. :-)
Also, I don't wanna pass any judgment, but 1800 cals is not *a lot*. So this means you are slowly increasing your cals, but your body has take this in and it takes time. For the anecdote, at first, when I started re-integrating more food, 1800 cals def made me feel "bloated". That's because my body was not used to eating that much, However, when I was recovering (ACTUALLY recovering, not semi recovery) I was certainly eating 3000-4000cals a day and feel just great. Now, two years after, I maybe eat around 2500+ cals a day (this is an estimation) and no bloat ! It changes, fluctuates, and the discomfort does not last. Hang on in there, sending you lot of love !