I have IBS and lymphocytic colitis - I’ve had IBS for years, ever since a bout of giardiasis, but the LC was only diagnosed 2.5 years ago.
When it was diagnosed, the consultant told me I needed Cholestyramine - it is an anti cholesterol drug, I think, but it is also a bile acid binder.
He told me that, in many cases, people with IBS don’t reabsorb bile acid properly - it is produced in the liver, enters the small intestine just below the stomach, does it’s job of digestion and then should be reabsorbed by the small intestine.
In people who don’t reabsorb it properly, it causes irritation and inflammation in the large intestine, leading to Irritable Bowel Syndrome, or exacerbating it.
Since I have been on Cholestyramine, my symptoms are so much better - much less diarrhoea, cramping and bloating - so I would definitely recommend you ask your doctor about it, @HappyMummy82.
It comes either as sachets, which you make up with water, but my consultant said they were nasty to drink, so he prescribed cholestagel tablets, which are a bit less effective, but much nicer to take.