Sounds like a mild case of, or the onset of a small intestine bacterial overgrowth (SIBO) or other type of bacterial infection. I advise contacting your doctor to be tested or sometimes they prefer to just prescribe a boad spectrum antibiotic (in this case it's most likely to be Xifaxan unless insurance try's to make you try alternatives first, but it's worth fighting back with a letter of medical necessity from your doctor as SIBO can get very bad, but it is more easily treated plus reduced likelihood of recurrence, if taken care of early).
Even if not SIBO, sounds like some form of digestive issue. I'd recommend cutting out as much sugar as possible or try and switch to natural (like from fruit), cut out carbs at least until better, and maybe experiment with other foods by removing at least 10 days then reintroducing (1 at a time).
If your problem persists, schedule an appointment with your doctor. If you stop passing your bowels, have chronic diarrhea, begin losing weight without trying, and more just use your body intuition and call if you think you should or absolutely if you have the symptoms listed. Your pain could be worrisome, but if it's only happening with food and always stops it's probably less urgent versus a persistent or even random onset pain there, but besides the appendix -the small intestine, the ascending and part of the transverse large intestine, gallbladder, right side kidney, and even the pancreas (though it's very deep and central) or liver (though it's not very low) - are potentially at play so you want to remain aware and know it's already a good enough reason based on current symptoms to set up an appointment with your PCP.