after a fall onto my tailbone I injured my lower back lifting a heavy box in an awkward position. Three weeks later, I spent some time on a motor scooter and sitting for several hours at a dinner. Now my anus and rectum are very sore, there is some pain passing stool, but particularly in flexing the muscles to pass, as well as unending dull pain and some sharp pain when standing, sitting or laying down. Pain is more pronounced as a stool approaches.