Agree with PP, cut yourself some slack. It’s not surprising that you’re reaching for easy to grab food, sugar, when you’ve been unwell.
Personally I would say don’t worry too much about things like carbs to start with, just focus on decent foods that will nourish you.
Breakfasts:
Poached or scrambled eggs
Wholemeal/seeded toast
Oats, either porridge made with your milk of choice, or overnight oats, added protein yoghurt (Skyr), frozen fruit that you can defrost quickly and add, mixed seed
Lunch:
Salad salad salad. All the bits you enjoy, not just boring lettuce. With chicken, smoked salmon, eggs, tuna. Even if you’re having a sandwich, have a “massive salad” 😉on the side. Try different bread options if you’re having bread - pitta breads, flat breads, bagels.
Dinners:
Vegetarian curries, coconut milk, curry paste, rice, lots of veggies
Stir fries
Fish, veg and rice
Mexican food, fajitas, enchiladas etc.
Tik Tok is very good for recipes!
And drink loads of water. Buy in some healthy things to snack on - plain popcorn, fruit, high protein yoghurt (Fage do individual fruit corner style ones). Dark chocolate.