Below is a link that you will find helpful: www.sparkpeople.com/resource/nutrition_art
I have lived off the smell of an oily rag for many MANY years, and believe me when I say, you CAN eat well on a tight budget.
Dried Lentils, Dried Split Peas and wholemeal pasta are great staples.
Buy specials as much as you can afford, and of things that keep. Often buying fresh veges is more expensive than frozen. IF you have good room in your freezer, buy peas (good source of protein and fibre) and perhaps mixed veges for back-up when the fresh you buy doesn't last the distance. You can bulk-buy carrots, chop them up and freeze them, if you don't have room in your fridge. Onions are another great purchase - cheap and good keepers.
Bulk cook soups and casseroles and freeze them in single serve containers, labeled and dated. I do this all the time and it gives good variety and cuts costs in ways people wouldn't normally think of - cuts power/gas costs because it is one lot of cooking and cleaning. I make really healthy and filling pizza doing that too, and you would be VERY surprised what ends up in them. Lentils, Split Peas, Celery, Swiss Chard, Carrots - heaps of things EVEN OAT BRAN :-) BUT they taste just like a bought one - LOL!
Oats are a very healthy, filling breakfast and very low cost. I make mine very thick in the microwave and thin it down after with Soy Milk. I find that I am more satisfied with that and a PIECE of (as opposed to whole) banana. I have PIECES of apple for a snack - hardly ever eat a whole one in a day. Because they keep very well in a fridge, I buy as much as I can afford and keep them in there. I even have a cooking apple that is as good to look at as the day I bought it about 4 months ago. I figured if they warehouses store there fruit like that, then so too can I but pay less when they are in season to do it.
I have cans of tomatoes, cannellini beans, baked beans, little cans of tuna - some flavoured and some in spring water - salmon, sardines etc. all bought on good specials. I hardly ever pay normal price for something. I bulk buy my good quality breads and sandwich thins and freeze them, taking a slice or two out as I want them.
I also keep a spreadsheet of every little thing I spend - even if it is a packet of chewing gum. You can soon find where you can cut costs on other things. I have done this since I was 16 yrs old - I am 59 now! THAT helps to keep things on the straight and narrow! If you have problems trying to budget, then you might find it helpful to seek the services of a Budget Adviser - you can access them for free.
If you find that you don't have money, or enough money, to buy all your groceries that you need, please do NOT be embarrassed to seek help from a food bank. I have had to use them a few times in hardship - our Social Services Agency has given me a non-refundable Food Grant to buy food - even clothing after I lost a lot of weight but wasn't able to purchase clothes that I needed - AFTER my trou had fallen off me at the Dietitian - LOL!
I hope that you and your husband find that you are soon on a healthier road - keep in touch and don't be afraid to ask for more help if/when you need it! That is what we are here for - to help and support each other!