Good morning . I will surely try to help u with this.. Has ur kid been suffering from Cold and cough regularly since birth??? Do u have any pets at home??? Have U changed his eating habits recently??? Is there rashes during the time of itching , if yes please upload a pic of the skin rash so we can plan what type of medicine to be given which can be applied on the skin. Have u done any blood tests? Long term allergies can be because of abnormality in the WBCs too. Unless we get to the root of cause , these symptoms will tend to recur inspire of giving regular anti allergic medicine.