Forgot to update on this:
Two other miscellaneous updates:
1) I've decided, in part due to @kyuuei, to start alternating my lunches/dinners a bit more. Which I guess means making a big batch of something freezer-safe once every couple of weeks, and noshing on it every once and a while. Also means making smaller batches of things, when they aren't freezer-safe. And means that my meals and groceries will be harder to plan. But if eating the same 3-4 meals all week is really THAT bad for you, then I guess it's worth it to put in the extra effort.
2) I cannot describe how difficult it's been to find an upper-body workout routine that's worked for me. Every single workout suggestion I've been finding is either a million times too difficult, or I don't feel any impact at all. I gave up on the push-up and plank sections of the exercise challenge I was working on, when I improved too slowly for the pace of the plank section (stalled out at 1 minute 15 seconds), and realized I was doing modified push-ups wrong and got 100000x worse when I corrected my technique. The whole thing is demoralizing, especially since I've always been insecure about my lack of upper body strength. (I'm naturally weak from the chest up -- even when I was a little kid, I couldn't use the monkey bars at the playground.)