I feel that overthinking due to anxiety is like running on a treadmill. You expend a ton of energy but you’ve not actually moved forward. Better to apply that energy to preventative measures or solutions. And if it is outside of your control? Well then just like the weather, you need to accept it.
I’m a big fan of meal prep. With a freezer you can freeze the extra portions and then thaw things overnight from your built stash. Without I used to just eat the same several days. I don’t mind and it was just me :)