What Could Acute Rectal Bleeding, Painful Tailbone And Arms Indicate?

My husband a few weeks ago starting having sever cramps which are now gone but along with the cramps started having pain in what he is saying feels like his tailbone, but also was having alot of bleeding from his rectum......so much so that one day he almost passed out due to the blood loss and now he still cant sit on a hard surface because it causes so much pain......the bleeding has now stopped by we are concerned about colon cancer...his father did have colon cancer......but my husband did go to the doctors and they did have blood work done and nothing showed up that would cause alarm........should we be concerned about this and could it be a sign of colon cancer? Also this week his arm started going numb on him and being painful.......Thanks for the help!