My friends 3yr ds is asthmatic, and when he doesn't get his own way, he screams at an earshattering pitch for ages - then he makes himself cough. This terrifies her into just letting him do what he wants, and she is at her wits end. I don't really have anything constructive to offer as my ds is only 18mo, and doesn't do that yet, although I am sure he will! Has anyone got any advice?