My Son Is 19 Was Stabbed At 15 Bowels Where

My son is 19 was stabbed at 15 bowels where operated on , took three hours to analyse
This happened 3 year so ago , every morning he has very unhealthy stools and vomiting for the last two days has not eaten been vomiting it smells of sulphur it's yellow with big bits and he is shaking shivering
Am very concerned by the unnatural odout