Hello, actually this question is for my dad. He is 62 years old, these are his symptoms. He has lost 15 pounds in 1 month. 6 weeks ago he started with these symptoms: dark blood in stools, little appetite (feels full), uncontrollable diarrhea, frequency of bowel movements - 10 / day, he notices when he eats fruit causes worse diarrhea. Now he has pain in his lower stomach.