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Hi and thanks for the details.
This seems like gastroenteritis or stomach flu. The gas forms in the intestines because of the ongoing bacterial activity and not due to the food intake, having an appetite and the pain and cramping settling down is a positive sign though. But since you are passing loose bowel movements (might be due to the laxative) and have a risk of getting dehydrated since you are not able to tolerate oral foods, I would suggest that you pay a visit to the ER for some necessary lab work, IV fluids and medication.
Hope this helps.
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