Hi my son developed a stomach flu on Friday he throw up several times ,had diarrhea and fever by Sunday he was better and then yesterday he started again throwing up and having diarhiaa! Last night he developed a redness around the lips which he still has today also! No more throw up but he had a very soft stul this evening! Is this ok to last for such a long time?why did the redness appeared on his lips?this is the 3rd time developing stomach flu in 1 year is that normal?