You probably bruised your coccyx bone and it takes a while to heal.
Try wearing extra padding where your tail lies upon the bike seat.
......I'll send you my bill.:D
* "For once you have tasted flight you will walk the Earth with your eyes turned skyward, for there you have been and there you will long to return."-Di Vinci
~"To thine ownself be true."~Shakespeare
~~~"He hath given His angels charge concerning thee, that they may keep thee in all thy ways."
~~~"If you dream a better world, eventually you'll wake up and make it a reality." .......Suzanne1020
~~~Virtus Junxit Mors Non Separabit~~~