I can see that you are very worried about your son. I am sure that his health will improve once we know what his problem is.Despite you seeing 3 doctors the main issue here is that you do not actually have a diagnosis of your son's problem.Children of his age do not usually get bronchitis especially repeated episodes of bronchitis. One possibility seeing that you know that he is allergic is that he has asthma. I strongly advise you to see a paediatric pulmonologist so that your son can be properly diagnosed and managed. There are experts in all the main centres. If you have any problems finding one of these experts let me know in which city you live and I will recommend someone.
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