Hello
Welcome to health care magic.
Abdominal pain,
watery stools,
vomiting can be due to acute gastro
enteritis caused by food
poisoning.
Most of the infection generally resolve in 2-3 days with or without treatment.
During diarrheal episide,only care of rehydration has to be done by taking oral rehydration solution after every passage of stools.If there is blood/mucous in stools,fever or abdominal cramps,giving antibiotics are considered.
As you said 3 days have already passed and now there are no more such symptoms,also the faecoanalysis report is normal,there is no need of any concern.
You can take probiotics in itself or as curd to establish normal intestinal flora.
Follow food safety measures while cooking,storing,handling or eating food/fluids.
Eat semisold well cooked food for 3-4 days then start with regular food.
Hope this information helps.
Wish you good health.