I know I'm a little late to the game, but if I can jump in...
TRACK. Either get myfitnesspal or use a little book and do the calories later. Honestly, it's easier to use paper when you're in the "1 bite" & "2 spoonfuls" stage.
Write a meal plan for yourself. "Cereal & fruit" is quite a different nutrient load than "egg, sausage or bacon" which is even more different than "cottage cheese & pineapple". 2 of those 3 meals are loaded with carbs/sugar. It's ok to have cereal & fruit one day if you're protein heavy the rest of the day.
Also, take into account how far along you are. OP, at 20 months PO, you should be above 1000 calories, I'd think. Every time I asked my drs how many calories to have they'd say "focus on protein, then veg, don't stuff" and track if I wanted, to see how many calories I was full on. I was around 900 forever, but couldn't hit 1500 until 3 years.