My son age 2.last five days before he had loose motion with vomit one time. And light fever before 5 days.after 2 days it's repeat.than my doctor says give oflax and flygyl for 5 days. Today 3 Rd day now his stool contain mucus and drop blood.its light black colour.and stomach pain also at the motion time.last 2 month before he had the same problem and it's clear in 7 days as per same treatment.now it's repeated.it is any serious please give me 2 openion.but my son not get tired.he is brisk.