female aged 60, had gall bladder removed, followed a few weeks later by removal of appendix, caecum, ilieal valve and a bit of bowel each side. I ve recovered from initial frequent diarrhoeia. Since then for last 2 years I have periods of constipation and bloating followed by several days passing 4-5 stools of more or less normal consistency, still with bloating, and feeling fairly grim. What s the likely cause?