Should I eat something else?

Right, so, for dinner, I made this small chicken stiryfry thing, using half a chicken breast, 1/4 cup dry quinoa and about 1/4 a large onion. Long story short, I made it too spicy on this hot day, ate a little less than half, felt ill, and threw the rest away.

I was wondering if I should eat something else? I mean, I'm not hungry- still a little sick- but I know I could stomach a bun and perhaps a peach. And if I did eat something else, how would I track that? I said I ate a little less than half, but I think that half was most of the chicken in the whole thing. Does it even matter, since today is technically a cheat day?

My main worry is that I don't want to eat anything if I'm not hungry, but I also don't want to under eat. And of course the bag of buns on the counter is looking tastier and tastier by the minute. What are your thoughts?

EDIT; I should also add that the buns are for sure healthy, because they're made by a friend at the Farmer's Market, but they also don't have the list of nutrition facts on it, so that would also add to my tracking troubles.