Bean and other legume dishes (chili, bean soup, lentils, etc.) are cheap, nutritious, easy to make in quantity, and freeze well.
The same goes for all sorts of soups, if you have the freezer space -- and soup may be just the thing for that first part of your recovery when you don't feel so much like eating. It can be major comfort food, too.
You may also be able to spread the word among your friends and family that you can use some help with meals for a few weeks. People often love to help out in these situations, and that can be a nice way to get some fresher meals, things that haven't been sitting in the freezer.
When you're a bit farther along in your recovery, if you have a crock pot it can be super easy to throw in the ingredients for a braise or stew, or something like a big pot of chicken and rice, and just let 'er rip for the day.