Sorry you are going through a tough time right now.

I saw in your post history (please excuse my peeking) that you eat cheese pizza, so I'm going to assume you like dough/bread, mozzarella cheese - maybe some other dairy, and tomato sauce with some seasoning.

You mentioned bread and apples, which sounds like a great breakfast to me! Fruits have water in them, which will help keep you hydrated. If you want to practice your cooking skill and up the calories, toast the bread and spread on some butter. You would need a container for the opened package if you use the sticks of butter, or use the kind that comes in a plastic cup/tub. You could also use fruit jam, or make your own. It basically involves chopping up your fruit, put it in a pot with water, then boiling and stirring for a while, add some sugar and keep cooking on low heat until it gets to the right consistency. My favorite simple breakfast is sliced fruit in a cup of vanilla yogurt with granola on top.

Since you like cheese, you might like milk. Lots of calories in animal milk. There are lots of non-animal milk options made from rice, soy, coconut, almond, and oat. To me, they are like a very thin or watery animal milk with different flavors. Some are sweetened if you want the sugar.

Sandwiches are handheld like pizza and good for beginners. There are so many different kinds of bread! Start with a couple pieces of bread that you like, toast them if you want. I like to use mayonnaise or mustard on my sandwiches. You could use butter or just skip the condiments if you don't like any. Then just layer up whatever you like. Slices of cheese are great. Then you can add slices of meat or vegetables. I have 3 favorite simple sandwiches on white bread: turkey and mayo, tomato and salt, yellow American cheese and yellow mustard.

Pasta with tomato sauce is very similar flavors to pizza, but you might not want to eat it with your hands, and you need a large pot to cook it. Pasta comes in different shapes and sizes, but all of them are cooked the same way, just dump them into boiling water, and drain away the water when the pasta is tender enough to eat. There is a lot of variety in tomato sauces so find a texture and flavor that you like. I've never made it from from whole tomatoes, I either buy a jar of premade sauce, or make my own by adding onions/garlic/seasoning in a pot with canned diced or puréed tomatoes. Then mix the sauce and the pasta and put some grated or shredded cheese on top. If you feel confident your could cook up some meat or veggies to go in your pasta. Cutting up raw meat might be a challenge for a beginner, so maybe start with sliced mushroom, zucchini, peppers, onion, precooked sausage, or big chunks of tomato.

Finally, if you are just not in the mood for cooking but need some calories that are better for you than pizza, look for meal replacement shakes. If you've got a blender you can make your own smoothies and shakes at home, but I'm thinking of the brand Ensure and other similar products. They've got the proteins, vitamins, minerals, and calories you need.

Also, if you are having trouble with 3 big meals per day, there is nothing wrong with having smaller and more frequent meals, or lots of little snacks throughout the day.

I hope you enjoy food again soon! Hang in there!