I don't understand why they would push out your appointment? Like schedule it for later if you tell them you feel suicidal? You said you feel irritable, too. Do you think you are in a mixed episode or something? I am concerned about you and if you are thinking up ways probably you should see someone sooner than later. If you cannot keep yourself safe and cannot get an appointment quickly you might need to go somewhere for emergency treatment. Maybe stress to your psychiatrist's receptionist that it is urgent?