Days ago i had a prostate examination. however, later, i always have a sense of defecation but cannot and seems anus is about to fall. what is wrong?

Prostate irritation: The prostate exam, in which the examining finger was pushed against the wall of the rectum and the prostate gland, was the probable cause of your discomfort. This usually clears up in a few days. However, you may have had an inflamed prostate and the doctor may have done a prostate massage in order of get the inflamed prostatic fluid to drain. This would make the discomfort worse and last longer.