My 15 month old son was vomited 6 times in the span of 12 hours two nights ago. I took him to the emergency room and they told me he had stomach flu, gave him a tablet and told me to give him pedialyte. Today he woke up with a fever of 40C and diarrhea. In the past 24 hours he's only had 2 peed diapers and about 8 episodes of diarrhea. He's also only drank about 10oz of liquid in the last 24 hours. Should we go back to emergency?