Came home from holiday abroad Thursday morning, by Friday evening I didn't have a huge appetite, Saturday morning the diarrhoea started and it has continued ever since. I don't feel ill, no stomach pain, just a bit of minor cramping and swirly stomach before I need to go, which is mostly in the morning. No real appetite, although I'm making myself eat small amounts of banana, plain white rice etc. What can this be? I'm never ill and have the constitution of an ox normally, so this is really alarming me.