Head loss and, therefore, the loss of a reasonable, rational control. Failure to realize the potential of the fear. Separation of the head from the body with the heart. Logical analysis in everyday life. The fear of decapitation. The fear of castration or impotence.
To dream that you are decapitated, indicates that you are not thinking clearly are are refusing to see the truth. You need to confront the situation or the person despite the pain and discomfort you might feel in doing so. The dream also suggests that you have the tendency to act before you think.
Please see also Behead.