Being Sick

I got my flu shot over a month ago but I've been sick with sick with flu-like symptoms, and discovered if I can't determine if it's from a cold, some bug or a virus or it's from some food I ate, it makes eating worse since I can't decide which among the few foods I can eat either caused the reaction or exacerbates the symptoms.

Eating less food from a narrower choice only makes eating harder with the few I know are ok. The short list of acceptable foods gets shorter. And it get boring and sucks.