Hi Elena, I understand your dilemma with being on a truly fixed income. I was in home healthcare and most of my "people" were too. I grocery shopped for them , with them most of the time to help them make the right decisions about better choices at the store.
You are getting a whole lot of carbs in all the breads and cereals you are eating. SOME carbs in your diet are necessary as your body prefers to use carbs first for energy. This is the single most lazy thing your body does for itself, and I'll tell you why. Carbs break down as simple sugars, sugar gives you instant energy (we all know this from drinking a can of Coke and eating a candy bar) BUT it burns fast and bright and is gone before you know it. Leaving you hungry and wanting something more. This is where snacking yourself into oblivion comes in.
There are better choices than breads for your carbs, you need fruits. NO this does NOT mean bananas since they actually gain calories and sugars as they ripen. I mean the fruits you have to chew, apples, oranges, grapefruit, pears, stuff like that.
You also dont get enough raw veggies. Instead of all the breads to eat a sandwich with, try wrapping your sandwich meat or whatever in a romaine lettuce leaf. I've actually done this and you save about 140 calories right there for not having those two slices of bread.
Start reading all labels, Like I like miracle whip, there is a TON of difference in reg vs light in calories and sugars , so I eat the light.
With your spaghetti, this one you won't like me for.... but cut your serving in half , eat it with a big side salad with just a little dressing, and NO BREAD or just a half of 1 piece. Since you are already getting alot of carbs in the spaghetti, you shouldn't have all that bread. Make your choice, it's either /or, not both.
Soups are easy, make your own chicken noodle with defatted chicken stock or bouillon cubes and only a handfull of heart healthy wide wheat noodles, you'll save a bunch of calories and fats if you do it this way, also throw in a few handsfull of frozen peas and carrots and you have a meal.
NO CREAM SOUPS! Eat tomatoe soup made with water. Much better option

Instead of the cereal, try airpopped popcorn if possible. Spray with Butter flavored PAM instead of butter and use a lite salt or sodium substitute.
You CAN afford to eat better, if you make better ,more enlightened choices. You'd be surprised how far your money will stretch if you eat more veggies(even if they have to be frozen)because they fill you up faster and last longer for more energy . Like chicken breasts (boneless skinless) and Tilapia fish, good choices, low fat, high in dense protein that burns slowly.
Kim