Mr. O has some malady whereby his symptoms include not eating and general crabbiness. I have even asked him, rhetorically, "What. Do. You. Want?!" No response but wailing. There is nothing so frustrating in the world as a screaming child who can't quite communicate in complete sentences what the problem is. Hugs were no good. Offerings of graham crackers and bananas were met with an emphatic "no" via head shaking.
We'll ride it out, but this is one of those times where a magic cure-all elixir would be very helpful.