Images of decapitation which appear in dreams have very complex meanings. To be decapitated in your dream may mean that there is a strong conflict between reason (the head) and your feelings (the body), which may eventually be won by your feelings and emotions.
The head is the symbol for reason and rational thinking, therefore if it is removed you will not be able to think clearly, you are going to be confused and insecure. Do not let yourself ruled by your feelings or your subconscious, try to 'keep your head', do not act before you think and don't rush in when taking a decision. Exactly like Rudyard Kipling said in his famous 'If' poem: "If you can keep your head when all about you/ Are losing theirs and blaming it on you"..."Yours is the Earth and everything that's in it." Consequently, being decapitated may also mean that you regret having taken a wrong decision.