welcome to health care magic
Regarding hyper eosinophilic syndrome,it is a myeloproliferative disorder
In the treatment 1st line of treatment is corticosteriods like predinsolone..
Hydroxyl urea is the 2nd line of treatment..
If you have more side effects,then another drug is there interferon
therapy like imitinibConsult hematologist
and try this medicine..
hope you understand my suggestion