Who has Bad bowel that give soft stool

I'm starting to get diarrhoea for 2weeks. Took antibiotic and recover slightly. Doctor say is stomach flu. After that still soft stool but at least got shape. Took probiotic given by GP only. 5 days later I start to feel uncomfortable bloat stomach and bit gastric pain and keep burping. Then when fart stool also come out. I'm very worry. Not sure what's wrong. Stools are extremely smelly too.