The Fashionable Blunt

It seems throughout the play that Blunt is focused primarily on fashion--using clothing to cover up his self presumed shortcomings. Granted, even Florinda tries to put him at ease about his poor looks in a less than contradictory fashion when she disagrees with his lines about his looks. I first find it ironic that in the final lines, he has completely transformed his focus on his poor clothing. (at least he won't be dancing naked at the wedding though, right?) But, does Blunt have a deficiency more than poor looks and luck? What does Adsheartlikins mean---is it speach disorder too, or some other more serious disorder that he had? And either way, I don't recall another character mocking him for these outbursts, which seem more noticable than his looks.