Feels a bit like musical chairs hey. And the music has indeed nearly stopped.
Each growing season will see many failures but this is how we learn. I don't talk much about the plants which didn't work in these posts, but you can be sure there are many! There must surely be ways to protect your crops from frosts or keep them cooler in those crazy hot months? As you say, we can't rely on shops or markets for much longer. Perhaps you could connect privately with the producers at your market and set up some kind of unofficial delivery system with them? If they have any kind of humanity left in them, they will understand your predicament and want to help you.