<human>: AskReddit, I don't know if I've got a virus or just some weird IBS-ish thing going on, but...

Nothing I eat stays with me. About two hours after I eat, I have to poop. I assure you, it isn't "normal".

It was like this ever since this morning, so I've cut down to something similar to the BRAT diet. It has had no success. I've nibbled on two bananas, a small bowl of plain (not honey-nut, plain) cheerios, and I even tried a legit bowl of cereal at one point. 

I live in a dorm, so food offerings are a bit...restricted (as in, I don't make the menu). What else can I try to see if it settles my tummy? 

I'm so frustrated right now, because I'm mildly hungry, but then I eat...and it's like I never ate at all. I have been trying to keep well hydrated too.

Can you summarize the given text in a few sentences?
<bot>: My tummy is unsettled today, and nothing I eat stays with me. Aside from things similar to/on the BRAT diet...what else can I try?