I think you answered a lot of your own questions in this post! A bad reaction to meds, diarrhea, not eating properly, and anxiety over thiscan definitely be the culprit. You are probably a bit hungry/dehydrated, and a coke on an empty stomach can cause some major gas, which for me gives pain in that region. The fact that your sister recently got her appendix out can also make you think you have a similar problem- kinda like if you read a medical text book all of a sudden you start to feel like you have some of the symptoms they describe, lol. Our minds can trick our bodies quite easily.
I wouldn't worry at this point- recently giving birth, having a bad reaction to meds and the relating anxiety, and not eating properly for a few days will definitely put your system a bit off. I would try to rule out other factors, such as hunger, gas, or anxiety, before jumping to conclusions. Eat something- then try to take some time and do something relaxing, like a warm bath, watching a favourite movie, etc. If by tomorrow, after rehydrating, eating, and getting some sleep, the pain hasn't gotten any better, then I would maybe get it checked.
Hope you feel better,
*amber*
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