I'm sorry that you're having to deal with this. Not knowing what to eat really hits you where you need things to just work already.
I've been having the same issue most days for months now. It was getting ridiculous, so I made sure that we were stocked with canned proteins (like tuna in water and sardines in oil), canned corn and peas, canned soups, crackers, and various condiments. There's enough variety there for me, they're simple enough to prepare, and the long shelf life means it'll be available when I need it.
Still, there are days when I'd pay someone to just deal with it all and plop a plate in front of me.