My son since september of 2009, gets a dry cough almost like clearing his throat. It continues till about July he is 5 yrs old. We have had him on asthma medications, gerd medications, allergy medications, and no one can figure out what it is, also took him to an ent because his tonsils are a bit large, and that punching bag looking thing (forget the name of it) is always touching the right tonsil, but ent doesn't believe that is the problem. Can you help me?