Help please very worried

Not sure where to post this but I’m very worried about my partner

He sees a dietitian to help out on weight and eat more he has only had one appointment tho! For 2-3 months now he gets pains in his tummy that can make him drop to his knees and then it will go! He poops about 5-6 times a day he poops more then he pees and he says it hurts when he eats also! He won’t see a doctor and I’ve been nagging him to go to the hospital! Coz it seems to be getting worse!

I ask if anyone has any ideas?