Worrying about something that hasn’t happen yet, maybe a social event or public speaking. Is your heart rate increasing and you're starting to feel shaky; this is commonly referred to as Anxiety. Fear and phobias on the other hand is more of a reaction to a current situation this could be fear of flying, Post-traumatic stress and numerous further events which generate extreme stress frequently improve with the treatment of a skilled impartial and non-judgemental qualified professional therapist.