I have had cold/flu symptoms for a few days(sneezing,coughing,fever,runny nose). The day after I noticed the symptoms I started having epigastric pain with diarrhea. It lasted for about 3 days and even though my bowels are normal consistency now, I have pain to my L abdominal side with strange bowels that contain a white, stringy substance (worms??) along with a ball of "puss" at times?