Wow, when the dream is recurring then you definitely need to listen to the message. As far as wondering what you have to say, it might not necessarily be something you have to 'say'. The throat chakra does represent speech but also expression in general. Are there emotions you are holding in? Are you a creative person? If so, have you done much to express this lately, or have you been too busy? Is what you do in life, eg your job, something you enjoy, does is let you be your 'true self' or do you need to 'hold back' a part of yourself? Do you feel stifled, trapped, frustrated in any area? These are just all examples and may be meaningless for you but maybe they might trigger something for you.