Hi there, new to the community, suffered with IBS for over 4 years now and had taken Colofac Mebeverine.. I stopped taking this around 2 years ago and take a daily peppermint oil tab, up until around 2 months ago I have been mostly ibs free for over a year and one day around a couple of months ago the diarrhoea hit like a ton of bricks one day, I struggled but slowly got it back under control and today I've woke up with agonising cramps.. I don't know why? Can you build up an immunity to peppermint oil??