Hi there ~
If you are passing frequent runny stools then you most definitely have diarrhea which is either viral in origin or is a result of food poisoning, rarely it could be amoebiasis
or another such parasitic infection
. If bacterial you would have runny stools too but it would be malodorous and maybe bloody. The acid reflux
can be treated with PPIs or proton pump
inhibitors. Visit with a GI specialist who can guide you. I hope this helps. Take care and have a lovely day!