I am also prediabetic (and gestational diabetic as well)and I was wondering about the amount of protein that was in the frozen dinner that you ate. Some of them are really starch based, and some don't contain meat at all...so that was actually most likely the cause of you feeling unsatisfied, and feeling like you needed to eat. (Like you were crashing.)
You will probably have to be more careful choosing varieties that have more protein in them-like choosing entrees that have more chicken, beef, fish, etc. in them over the ones that only have a little or none-such as fettucine alfredo, egg roll and rice, etc. Some of the best Lean Cuisines are the ones that contain whole grains like brown rice, instead of white noodles or white rice, as well. (The description of the meal will usually say whole grains, etc.)
Fruit usually doesn't give me any trouble at all-even grapes and bananas-which are sweeter fruits-as long as I am consuming enough protein at each meal.
However-if you are prediabetic...even if you are feeling bingy-it isn't a good idea to load up on the chips, cookies, and other refined carbs like you did after the meal in question. If you are hungry, eat more protein, fruit, veggies, dairy, or whole grains etc. instead. The refined carbs and sweets will make you crash more later on.
