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Considering your pain just below your rib cage in right side + nausea + Aversion to meat (Fat)
I am thinking of the following possibilities.
1. Cholecystitis – Infection and inflammation of the gallbladder.
2.Peptic Ulcer – An ulcer in stomach or duodenum can typically cause this symptoms.
You can try taking antacids or OTCs anti ulcer drugs. Avoid spicy foods, skipping meals.
3.Hepatitis or something to do with Liver
4.Non significant causes – Like pain arising from the muscle or bone, which will resolve by itslef.
I would like to know few more details. How old are you ? Your sex?
Do you have any complaints of black tarry colored stools ? Do you have any fever ?
Were you recently exposed to any contaminated water ?
Please post a new question from home page with the above details.