Coccygodynia, or pain at the tip of the spine (coccyx), is most commonly felt in the sitting position. It can occur after falling on one's backside(buttocks), after childbirth or occur spontaneously without any cause.
In these cases, both acute or chronic, Codinex would be a great and immediate help for you.

note:
The information provided is of a general nature and should not be used as a substitute for professional medical advice. To diagnose clearly you should discuss with your family doctor.