My son is suffering with cough problems since last 1 year. We have seen many general physicians but that doesn't help. We have given him benadryl many times but that gives him relief only for some days and the cough starts again. When he plays or runs fast he started coughing continuously. In the the nights also he wakes up due to cough and vomit occasionally. We are not sure what he is allergic of but it is trolling his health.