It is not a good dream to see Head in the dream "Khawab Mein Sir ka Dekhna". There is no such thing as a bad or a good dream. There are different tabeers and all of them are authentic. People face hardships and worries in their lives and can avoid them by giving the Sadka and sakda, which is mentioned by Hazrat Muhammad P.B.U.H as well.
The Prophet Muhammad said to give the sadka to those who had nightmares or bad dreams. Those who help others and who share their wealth with the needy and the most deserving ones are blessed by Allah Almighty. When someone sees a head in the dream, it has been interpreted as the person will suffer a huge loss in his life. It will be very difficult for the person to further carry on his business according to the interpretations of such a dream.
