Hi Janet,
Perhaps a trip to see your GP, they may refer you for some tests or a specialist. If you are doing all the right things, then they might be able to through a different perspective on it.At least this will not cost you anything, and worth exploring too. I know of someone who had a similiar problem, tried all other avenues, she went into hospital, and had the camera in both ends, they found a restricted area of the bowel, which they sorted, and had no problem since.
Therapist1960uk