During the week I routinely eat either oats or grits with 1 or 2 poached eggs, so carb/protein combo, if you're getting hungry between breakfast and lunch maybe you could bring a snack, like a hard boiled egg or an ounce of cheese, or nuts to carry you through.
Unless you really aren't allowed to eat at your job, there's no reason not to have a snack in between. I think it's a law some places that you have to get a break after 2 hours. Maybe getting up for a little walk.
Best of luck to you, keep trying different things, you'll find what works for you, sometimes it takes some time, but this is for life, so don't feel rushed, take your time and figure it out, great job reaching out for help