Interpretation of dreams: The interpretation here depends on whether the pin is sealed or used to pierce something. If it's the former, it means that you took advantage of the emotional relationship. If it is the latter, the pin may symbolize the trauma of the soul.
Psychoanalysis: People sometimes recall some feelings in their daily lives in their dreams. If numbness plays a certain role in dreams, it means that you don't care about your energy under certain circumstances.
Spiritual symbol: You may not be able to solve the mental problem, and you need a transitional solution, which is a pin in your dream.