Welcome Rawrberry,
I suggest you give up on pasta and bread for now.
Oats are your best bet; pure oats contain no gluten. Although some are grown near or in the same fields wheat is sometimes grown, so they can contain a stray wheat berry every now and then. Depending on how sensitive you are, you can get gluten free oats (but you will probably will only need regular oats, like quaker, which are like 99.9% gluten free).
Oats are a good source of fiber and protein.
Oatmeal makes a solid breakfast.
Sweeten your oats with artificial or natural non-nutritive sweetener (low calorie, or calorie free). Splenda or Stevia are both good options, depending on which you like the taste of. Don't use sugar, it's empty calorie and will cause you to become nutrient deficient (even "raw" sugar is bad for you; it's all the same, just marketing).
I would encourage you to also avoid rice, since it is very low in protein. Focus around oats as your whole grain, which are cheap, widely available, and more nutritious.
Aside from that, eat beans and vegetables -- dark vegetables.
Don't eat much fruit, it's not nutritious. Sweet fruit is mostly empty calories. You can enjoy one or two fruits a day, and that's fine -- or a hand full of berries. But don't make fruit a meaningfully large part of your diet. It's a dessert.
You can used canned beans, or dried beans (which you need to soak before boiling). Eat at least a couple cups of beans and legumes a day.
Vegetables aren't very expensive. Buy them frozen. You should eat at least a pound of veggies a day. I recommend two pounds a day. Focus on dark green ones. Collards, mustard greens, kale is OK, Broccoli is OK.
Don't eat too much spinach.
Enjoy walnuts as a healthy source of essential fatty acids.
And finally, make sure to take a B-12 supplement, and supplement vitamin D if you don't get a lot of sunlight.
I'm glad to answer any questions you have.
