Sorry you are going through rough times. I've been there
and I learned how to eat on next to nothing.
At rock bottom I was making a huge pot of vegetarian chili and eating it for lunch and dinner for 5 days. I used dried beans (cheap!) cans of tomatoes I got on sale, onions and whatever else was cheap. I also made corn bread to go with it. I liked chili but I wouldn't recommended it!
There are some great frugal recipe sources on the web---many of them are part of "stay at home mom" sites. Look the sites over for other helpful tips and ideas.
Basic recipes:
http://www.miserlymoms.com/MOMfrecipes1.htm
http://www.frugalrecipes.com/
http://www.betterbudgeting.com/frugalrecipelist.htm
Some sites address making one recipe and then using it for lots of different dishes. If you have lots of ground beef, then you can do a ton with it:
http://www.christian-mommies.com/special-features/just-for-moms/one-recipe-many-meals-save-time-and-money/
There is also the "cook it all one day and freeze it" approach where you can make up a bunch of things from the beef and spread the meals out.
http://www.frugalmom.net/beef_recipes.htm
Try to plan your meals to use leftovers and ingredients you didn't completely use--for example if you have a recipe that needs 1/2 a container of sour cream make sure you have another recipe that week that will use the rest. Or double up what you cook and freeze half---or since you are just one person you may find yourself freezing several portions.
Buying a bigger container of sour cream or carrots or cheese or ???? can make more money sense then just buying enough for one recipe and you CAN do it without having the same meal every night.
For me I might start on a Sunday with a whole chicken, veggie crescent rolls on Monday, chicken pot pie on Tuesday, hamburger stroganoff on Wednesday, baked stuffed potatoes on Thursday, and homemade pizza on Friday. FYI Someone usually has leftovers for lunch the next day.
If you buy a whole chicken and bake it, you can use the leftovers (and any leftover veggies) to make chicken pot pie. Mix the chicken with some gravy, toss in the veggies (or buy a cheap bag of mixed veggies) heat it up and dump in a pie plate. Toss a crust on top and bake. I also boil the bones and some scraps in a bit of water to get broth for soup asnd freeze it.
A favorite hamburger recipe: if you have onions, chop them up and brown in a pan. cook beef in pan until browned. add some beef broth until you can see the broth in the pan but it isn't soupy, sprinkle in some worcestshire sauce. once it is heated through add some sour cream and stir. I use just under a cup for 1.5 pounds of hamburger. It will be creamy but not thick. heat through and let stand for a minute and it will thicken. Serve over egg noodles. Green beans, carrots or broccoli go nicely with this. DH calls it hamburger stroganoff and that may be its real name :)
Veggies + cheese on crescent rolls: Whether or not this is frugal will depend on sale prices, but it is something different for supper and is a great way to use up veggies and cheese. You'll need butter or oil, carrots (big ones) onions, beans and whatever else you like for veggies, a can of crescent rolls and some shredded cheddar and/or cheddar-mozzarella cheese, and basil or italian herb mix.
Slice carrots so they are thin-- but not paper thin. Cut up the other veggies into bite size pieces. heat some butter or oil in a pan. cook the onions until they are translucent, then cook the veggies. add them to the pan in order of hardness. For example: carrots and broccoli cook for a few minutes before you add something like summer squash so the hard veggies get mostly cooked before the faster cooking veggies are added. You will need some hard veggies in there. All soft veggies like squash or tomatoes and the bottom "crust" will get soggy.
Preheat the oven. as the veggies finish cooking add some basil or the herb mix. I honestly don't know the measurements because I wing everything so look at the container and see if there is a recommended amount to add to food. It is probably a teaspoon or two. Then unroll the crescent rolls and separate the dough into rectangles (not triangles) onto a baking sheet. Scoop the veggie mix onto the rectangles and sprinkle with cheese. Bake according to the crescent roll instructions, but keep an eye on it and remove from oven when rolls are baked and cheese has melted.
Baked stuffed potatoes: take the basic veggie mix above, bake some potatoes (use microwave to hurry it up if you want) scoop out the insides and mash them. Use a little butter and if you have sour cream left over from the hamburger recipe then use that to help mash the potatoes. Mix in the veggies and for four potatoes about half a cup of shredded cheese. Re stuff the potatoes and put on baking sheets. sprinkle some more cheese over the top and bake in a 350 over until the cheese melts. You can also grease a baking dish and put the mix in there and bake it.
Homemade pizza is really cheap. Here is a page with a bunch of recipes. http://www.easypizzacrusts.com/ Personally I use flour, oil, yeast, salt, sugar, cheese, and tomato sauce and pizza seasoning for the sauce. The flour cost next to nothing, ditto for the tiny amounts of salt and sugar, the tomato sauce you can buy in big cans and mix with pizza seasoning and then freeze what you don't use, the cheese you can buy in a big bag and use up during the week.
These are some of my old standbys and hopefully they'll work for you. If anything is unclear just email me. I usually make recipes up as I go along and I'm afraid it shows.