I had knee replacement surgery eleven days ago and still have the most appalling stomach problems. The diarrhoea has stopped (mainly I think because my painkillers have bunged it up a bit), but I still feel 'icky' a lot of the time.I'm also flatulent. This coupled with the most amazing tiredness still in the middle of the day. I know I'm 65, but I wasn't anywhere near as debilitated as this when my knee was at it's worst.Should this type of post anaesthesia tummy still be persisting after eleven days? Any patients, doctors or nurses in the Mumsnet house?