Suggest Treatment For Headache, Nausea And Vomiting

Hi, may I answer your health queries right now ? Please type your query here...my 13 year old daughter has had a head ache and nausea,and throwing up.it has been 3 weeks.we thought would pass the first week,cause we thought it was a virus. i thought it was nervs. i dont know any more.I thought it was sinus and allergies.help her and me please.thx suemom