What Causes Nausea And Ear Pain In A Child?

Hello Doctor, My daughter is 4 years and 2 months old. She is having vomiting tendency specially in the evening but she does not vomit. Her stool is normal and no abnormality is seen. She is taking normal food like rice, curry, milk etc though she is not very keen to have it. She does not have fever. But complained pain in her ear couple of days back. We consulted an ENT specialist who has ruled out any problem/infection. What can be possible reason for this vomiting tendency and what could be a good remedy? Regards, Swagata Biswas Kolkata, India