Oatmeal actually makes me hungry and I end up eating more for snacks! This happens with "good oatmeal," even when I put nuts and fruit in it. I have to have protein: egg whites or eggs, turkey bacon, tuna. I usually allow myself one day when I have waffles and even though they are filling and I top with fresh fruit and nuts, I am starving within two hours.
Try eating dinner for breakfast, along the lines of what Emily said.