@Remaker Thanks for the advice. I don't want to jinx anything but it seems to have calmed down a little today. So at the risk of too much information, I was constipated for ages before, it was taking three different laxatives for anything to happen. Now suddenly the main problem has been cramping, painful, loud gurgling (my son thought it was someone walking around upstairs) and some wind, which followed a day of vomiting bile in hospital the day before I came home.
I haven't been eating that much really, pretty low residue. A few Rice Krispies, a piece of white toast. I didn't have an appetite before the op and it isn't back.
I am currently on my third course of coamoxiclav in four weeks and along with the bowel prep I don't think this has helped.
@TopOfTheCliff Peppermint oil is my go to for this kind of thing, it was great for the post op shoulder pain last time but not so effective for this, so far.