My husband hurt his back from a fall for a couple weeks, but when xrayed there was nothing wrong, so he went to the chiro a couple of times and felt great. Maybe unrelated, but about  two days ago, he had a sharp left dull  back pain and when he came home he had  bowel movement and there was blood in it.  Since, then his bowels have been normal, but still has the dull back pain. He says it doesnt feel muscular.  The back pain comes in waves.
Hi, With the information provided, I can tell you that the blood in stool is due to the trauma to bowel and the following weakness is due to damage to spine. Get CT scan done as soon as possible for both bowel and spine as corrective measures can be taken for the bowel as well if it has not resolved on its own. Further instructions can be given only after the investigations. Best of luck!  :)