To dream that you are breathing rapidly implies that some issue in your life is causing you great worry or concern.
To dream that you are breathing underwater refers to your time spent as a fetus in utero. You wish to unburden yourself from the pressures of your adult life. You want to be released from obligations and stress. It's possible that you feel vulnerable and need someone to care of you.
You may be too caught up in your personal feelings and feel like you are drowning under the pressure.
To dream that you are holding your breath implies that you possess a strong will and are persistent and rigid in your beliefs and opinions. Perhaps the dream is suggesting that you should consider other points of view.
To dream that you cannot breathe reflects fatigue that you are experiencing.
To dream that you have bad breath implies that you are not being completely honest with yourself or other people