For info for the others:
IC isn't like normal cyctitis which has burning pains on urination etc.
IC doesn't feel like that so it can be undiagnosed for years. It can cause very frequent urination which I had originally put down to the bladder prolapse but instead it was IC which had to be treated before he could repair my bladder surgically.
I went on to develop IC, it was discovered when I was being examined for a hysterectomy/prolapsed bladder, brought on by Tamoxifen/Exemestane.
The gynae chap found that my lower abdo was very tender and I had blood in my urine. I had a cystoscopy under a GA to ensure that I did have bladder ulcers and not bladder Ca. They also stretched my bladder during the op and that helped and it can tend to get stiff and small.
I was given a course of several drugs (antibiotic, stomach ulcer drugs and a bladder tamer) to relieve the symptoms but there is no cure.
The IC was brought on by a combination of a tendency to gain more auto-immune diseases (I now have quite a collection) and it was exacerbated by the use of Tamoxifen.