I am a huge believer in the fact that thought is creation! The dominating thoughts in our minds are what our subconscious minds transmute into reality. It is through our subconscious mind that we connect with infinite intelligence, so having said that - what I do when I feel a negative thought coming on, is I consciously negate it and replace it with a positive thought flow.
It is important to know that the subconscious does not discriminate between negative and positive thoughts, so be sure to stay positive!