Ahh! Why do I feel so sick?? What's wrong with me??

I 've felt so completely sick for the last 4 or 5 days - so bloated I look like I'm pregant (and I'm very thin, so it's expecially promient), constant nausea and feeling like vomitting, lethgaric... overall just disgusting. I feel slightly better after I go to the washroom... but then it comes back. What's wrong with me?? I was okay last week. I'm wondering if I have food poisioning? It all started after I consumed some olive oil on a salad and it had a werid aftertaste, which makes me wonder if it was rancid.

:(:( I feel awful and I have to study for school! I can't afford to be sick - is there anything I can do to speed this up? I've had a huge craving for papaya while sick if that means anything, so I've been eating A LOT papaya everyday (one or two jumbo ones). Otherwise I can only manage oranges, avocados and a few tomatoes. Everything else just turns me off completely.

I've been megadosing on probiotics and taking 1 cup of aloe vera juice everyday to help fend off the nausea. I usually juice everyday, but surprisingly my body just doesn't want juice! The thought of it makes me feel sicker. I feel like my stomach is heavy and like it's not emptying very quickly. What's going on? Any advice please??

Thank you!!