How about buying the meal plan? That way you don't have to count, just follow along. If you can't do that, then focus on these crucial points:
-eating smaller portions
-eating as low fat as possible
-replace butter with 100% vegetable margarine, ideally from canola oil (soy, sunflower, safflower are next best)
-no red meat
-no cereal or other highly fortified foods
-no oats
Just do the best you can in each area and remember every bit helps.
I have always had a light and short AF but on the LE diet it became even lighter and shorter over time so that's a normal response. Your cycles getting shorter is not uncommon at your age but I'd try to get some Femara just in case it hrlps egg quality (theoretical) and to help your pink sway.