My DH had problems with his bowel for years and so did his mum before him. I eventually gave him an ultimatum to get sorted as it was really affecting our ability to go out even on short 5 min walks. After some investigation it turned out that the cause was Metaformin (sp?) prescribed for his diabetes. after consultation with the GP, he is now off of it and all problems resolved. Might be worth asking if you are in a similar situation.
Conflicting high cholesterol and triglycerides advice
Our Welfare State. Is it broken?
NHS U turn on trans terminology