Sounds crazy but has anyone tried 'Motion Potion'? I was buying a probiotic in a local health food shop & they recommended this. It's Australian & has only just hit the UK. They gave me 3 small sample packets but I haven't tried it yet. I think you can ask for samples on their website. It seems to great reviews for IBS & Diverticulitis etc. In typical Oz style the marketing for it is pretty cool actually.
The girl in the shop told me to start with a lesser amount than the recommended does & to drink loads of water after. I'm thinking of starting it tomorrow. I'd be interested to hear if anyone else is aware of it/has tried it.