Thanks for the query to H.C.M. Forum.
Since three years passed, headache and fever
, off & on with itching.
In my opinion ,you should take another opinion.
Please get in blood examination as , C B C , E S R ( CHRONIC INFECTION), total eiosinophils count ( cause of itching and also cause of fever).
Cause of concern is headache and fever.
Antihistamine is very good for itching and you have to take it till final diagnosis.
Hope I have answered your question.
If further question I will help.