overly dramatic eg. That outburst was entirely unnecessary. You are so dramatical! (source: http://onlineslangdictionary.com/meaning-of/dramatical)
1. Of or relating to drama or the theater.
2. Characterized by or expressive of the action or emotion associated with drama or the theatre: a dramatic rescue at sea.
3. Arresting or forceful in appearance or effect: a dramatic sunset.
4. Music Having a powerful, expressive singing voice: a dramatic tenor.