Asthma in a three year old child

I have a three year old boy who has multiple food allergies and can have severe asthma attacks. I have been reading about alternative treatments for his asthma and searching for a cure although the common belief is that there is no cure for asthma. His homeopathic doctor told me that he has parasites but he is not doing much about it and I do not think I can administer Hulda Clark recipe of parasite cleannsing since he would not cooperate. I am also entertaining the idea of getting a zapper for him. Anyone tried it and saw results? Anyone knows of a kid friendly remedy or treatment? I would deeply appreciate it.