Thanks for posting your query at HealthCareMagic. Allergy or hypersensitivity is practically excessive and improper immune response to something that is not harmful but the body confuses it with something harmful and hence produces a inflammatory response to combat it. So, the stimulus is something that our body does not normally need to react to. Dust is one such allergen. There could be many others and you have to identify the things your child is allergic to. There are two things that can be done. One is to decrease the immune response of the body by the use of steroids, as is being already done in your case. The other thing is to avoid the stimuli that the body is reacting to. There can be no other type of treatment irrespective of where you go in India or abroad. Please be patient and follow the advice that your doctor has given. It would have been really helpful if I could know the eosinophil count in blood. The chest pain that you mentioned need not be in the heart. It could well be due to gastro esophageal reflux or a lung cause and it is difficult to comment further without evaluating. Hope that the above information would be helpful to you. Feel free to revert back in case of further queries if any.