Centaur - symbolizes the duality of human nature. It indicates that you are trying to balance your intellectual/mental nature with your physical nature. The centaur also represents humanity, wisdom, and compassion.

House - A house usually always represents you, or rather 'the self'...your body and the attributes of your personality. They symbolize our emotional and psychological selves. All of your experiences, stages of development, and parts of your conscious and unconscious life may be represented by that house. The house may be representing issues concerning a particular dilemma in your life, or it may be more general and comprehensive.

Arrow - represents something that has really 'gotten into' us....like hurtful remarks or actions, being 'pierced' by a powerful emotion such as love, turning attention inward in a wounding way, also could represent a message of love,  endeavor, or opportunity.
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Did you do something nice for someone, and they didn't appreciate it?
Did someone accuse you of being insincere, or make any other remark that hurt your feelings?

Without knowing more,...I hope this helps some, good luck.