My 21 months old son has been vomiting for the last 3 hours. First he vomited water and liitle food he ate, then every 20 minutes it is bright yellow bile. The doctor on call first said i should put him to sleep, he was very lethargic, sleepy, out of it. I called back few minutes ago and heard that i should wait another hour and a half, and if it doesn't stop, i should go with him to the ER. What should i do? It seems to be getting less frequent now, about every half hour. Please advice. Thank you.