A Friend (male) Who Is Under A Lot Of Emotional

A friend (male) who is under a lot of emotional stress has not been eating much and losing weight. He gets very gassy, food goes right through him, and he's had rectal bleeding after bowel movements a fewt times. Is this all stress-related, or is there a physical problem? He has not had any of these issues regularly before, and a few months before the stressful situation started he had a physical and had a clean bill of health. He does have an umbilical hernia but his doctor did not see a need for urgent treatment at the time of his physical. (We can't get him to see his doctor again now.)