Hi welcome to health care magic.... The cause for eosinophilia should be searched and than comment can be given like that whether it can lead headache... If eosinophilia is from acute allergic rhinitis, sinusitis or respiratory infection than it can lead headache.... Your eosinophilia should be evaluated and cause like asthma, respi infection, parasitic infection searched for and specific treatment can be given.... For allergic inflammation Allegra LC like drug useful... Chronic tension, anemia, lack of sleep , irregular meal and hypertension like common cause also should be looked for.. Take care Advise : Physician consultation for examination..