HI WELCOME TO HCM
-i had gone through your query and understand your concerns. i would come up with the possibility of ALLERGY
may be the underlying cause,which prevent the prognosis of the your son condition.
i advise you taking Homeopathic
medicines gives safe and permanent cure for your allergic complaints along with management.
Usually in such cases I will give treatment for my patients in the following manner
give him IPECAC 30 poency tid and SENEGA Q tid usually suffieint to cure.
consult your local homeopathic physician for correct diagnosis of the case and remedy to fit his complaints
I hope this is helpful for you, thank you