autosuggestion

n. influencing one's attitudes or behavior through self-suggestion, self-hypnosis (Psychology)

The term autosuggestion is used for positive or negative physical symptoms explained by the thoughts and beliefs of a person. For example, some will experience more pain when they think it will hurt. Headaches sometimes go away after taking a painkiller, but before the painkiller could actually start acting on its own. Related to this is the placebo-effect.
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Autosuggestion /au·to·sug·ges·tion/ self-suggestion; the process by which a person induces in himself an uncritical acceptance of an idea, belief, [more]Autosuggestion - Community and Resources

Noun
1. hypnosis induced by yourself
(synonym) self-hypnosis, self-suggestion
(hypernym) hypnosis

n. autosuggestion, influencing one's attitudes or behavior through self-suggestion, self-hypnosis (Psychology)