Oh don't worry about bodily functions Nicola it happens to all of us at some times

. Have you looked at the PIL (patient information leaflet) for the side effects? it could be that, but IBS can cause diarrhoea . My daughter suffers with this at times, I have noticed that she doesn't mention it so much now, I find things that I can't even wash, but she's a teenager now, bless her and must be finding it a bit difficult sometimes <3
Did you manage to find an IBS support forum ?
Just keep an eye on it and if you are worried, see your GP again ,or ( phone consultation) or a surgery nurse. Take care x