Did you have endometriosis on the bladder? Did you have a urine sample checked for infection or the presence of red cells? Endometriosis is commonly found on the bladder (and urinary tract) and can lead to “cystitis” like symptoms with no bacterial source. Do you have access to your surgical report (and histology) to check if there was any on the bladder that was left in place?
The IBS symptoms can be improved with Low FODMAP – but where there is mucus present – you should be investigated by colonoscopy to rule out other causes. In most hospitals now (and available to GP) we are able to run a faeces sample prior to booking a colonoscopy called Calprotectin. This can help identify if a colonoscopy is needed and also help diagnose inflammatory bowel conditions.