Hi ADHDmomma and MessMom! Thank you very much for your suggestions! I have just created a Pinterest account. I am grateful for this suggestion: cooking and storing in the freezer. I had never really thought about doing it, but it is actually the case that, in general, I tend to cook too much, and a lot goes to waste because it is either not stored in the right way, or the leftovers are not sufficient for one meal. So, I will be cooking a little larger amounts, so the leftovers are sufficient for one or two meals.
I am also grateful to know that microwave dinners are not really something I should stress that much about!