I have been having this exact problem with my son, who is 6, this week. He vomited and had diarrhea once Sunday night. I kept him home from school Monday. He was fine all day and night Monday. Then vomited on Tuesday night, Wednesday night and twice Thursday night. He has no fever and is fine all day. I haven't yet brought him to the doctors but if this continues, I guess I will have to. Was curious to ask what your doctor thought? I was thinking the possibility of reflux or anxiety, but just not sure. Thanks and good luck!