Blood infection, My son i facing ?

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My son is facing with blood infection since last two months, still his treatment is continue.Because of blood infection he has been facing problem of cold, cough and fever. every second day he caught by fever. I am so tired now giving medicine continuously to him. Doctor stopped his medicine of cough because he had been feeling well but after two weeks again he is facing problem of cough. I am very sad now and do not understand from where i should get him treatment. he is only of two years and three months. I really feel sorry for him that in this little age he has been caught by this problem. could any body suggest me what to do?