82 year old male had inguinal hernia surgery and was unable to urinate after surgery. He was sent home 5 hrs after surgery with a catheter. (Initial catheter was removed and then put a larger catheter)

Later that night, hemorraging from penis and pain in the groin area. Almost 5 weeks later,he is still in the hospital with an extremely swollen stomach, and they are constantly flushing his system because of blood clots that clog the catheter and produce extreme pain. (He has had numerous catheters inserted and re-inserted up to around size 24) He is in a lot of discomfort, still bleeding(had to have 1 unit of blood), still gets blood clots in the catheter, no appetite because of his situation, and his stomach is so large it looks like he is pregnant. What test do doctors use to determine where all the blood is coming from? Could his uretha or bladder been punctured to be causing all the blood loss?