How Can Dry Cough, Breathing Difficulty And Vomiting Be Treated?

10 yr old male, history of allergies, takes 10 ml of Claritan and Flovent twice daily when symptons arise. Dry cough keeping him awake, Proventil prescribed has little effect, labored breathing, coughing until he vomits, severe anxiety. Cool humidifier in room. Rubbed Vicks on chest back and bottom of feet. Seems more comfortable laying down rather than sitting up. But has to sit up when he coughs and then will throw up and cry. Croupy cough, nothing comes up. No fever. Will drink water.