WOW! You sure do have your hands full! I've never had the same situation as you, but I have a few tips I learned as a single mom going through nursing school.
First, Set up a rewards chart for the boys-if they already have one, increase the stakes-is there anything big that they want, or cash works quite nicely for my daughter ;-)
Second, invest in a large slow cooker (crock pot)if you don't have one and a good easy slow cooker cookbook. This is a good one: http://www.amazon.com/3-Ingredient-Slow-Cooker-Comfort-Fo....
With a big enough cooker, there should be plenty of leftovers. It's really easy to throw chicken breasts into the cooker with a jar of salsa and voila: burrito filling.
Third, make a lot of casserole type dishes ahead of time-Lasagna, enchiladas, etc. and freeze them.
I have a Foodsaver, and have sealed pieces of Lasagna (it helps to cut into squares, freeze, then seal it or else it gets squished) taste fresh after three months.
Do you have a gas grill? A large package of frozen burgers or brats go a long way.
And speaking from personal experience (I had a cast from my elbow to the tips of my fingers a few years ago and was also in an accident a few weeks ago that has caused bad back/neck pain), DON'T be afraid to ask for help!! Also, don't get worried if the laundry doesn't get folded how you want it, or doesn't get put away. Let the furniture get dusty, if one of them vacuums for you, don't expect them to move things. These are just little things to live with for a few months and when you're healed it will all be better!
Good luck!!!