Hello doctor

i have a friend here who is suffering from a very severe case of dust allergy. He's had his tonsils removed when he was a child and that proved to be a mistake as his doctor says. When he was 11 years old, he suffered an allergic attack and he was hospitalised. He lay in coma for 2 days. His doctor says that he has extremely low resistance and another attack like that may prove fatal. Now he is 19 years old. He gets very high fever frequently, like once in 2 weeks, and a bad cold almost every day. He gets small attacks often. These are seemingly caused by nothing, they are always sudden. He can't stand in even a mild dusty place without coughing continously for 30 minutes. He has a high eosinophil count of 13% and his doctor has told he cannot be cured unless he builds his resistance. He's been a weak chld since birth. He takes evening walks and eats fruits to improve his resistance. He absolutely refuses to take up meditation as he believs its of no use, and nothing can cure him. I get scared now everytime he gets an attack cos he speaks like it might be his last breath. Please help.