03/03/2015,My stool looks like froth minutes after I have used the restroom, because I was sick for a week, Sunday, I was hot, and took an alka seltzer ( cold and cough ) and stayed on the toilet for awhile, the stool was very watery, silvery and black. Monday night, I took a anti - diarrhea and TUM for gas Just bloating and gas, a little bit of diarrhea farting and now, no solid stool No vomiting at all. What happens if the froth and diarrhea at the same time continue.