We all get days like that, especially as our senses sharpen. I find that food - even food I wouldn't normally eat - smells better, and I imagine it would taste better. But the truth is, it's all in the mind. If you were to eat it, it would taste either awful or a lot less good than you imagined.
You simply have to press on through, I think. Occupy the mind with other things. You can make it.