How Can migraine And Vomiting Along With Cough Be Treated?

my 12 year old daughter had a gradual onset of migraine type headaches thru the last 4 months then her lower back started to hurt off n on our family just suffered a traggic accident where her papa was in a fatal car accident and he was a big part of her life so we talked to a dr and thought maybe just stress and greif and put her on some supplements she seemed to get better but after the last two weeks weve had a bought of flu type illnesses run its course thru our family of 6 sore throat fever chills body aches stuffy nose then developed in to a cough ... 2 of our kids even had a 24 hour stomach bug nausea an vomiting now her and her dad are having similar symptoms but hers are worse very sore lower back sore throat some loss of appitie dry cough headaches and high fever hers was at 102.9 i have givin tylonol and motrin in staggared doses seems to knock it down and help with the discomfort what could be causing this