I have lived through that, we had lengthy conversation with the doctor and finally decided to remove it. According to latest studies it seems that one of the functions of it is to harbour gut bacteria in the event of severe diarrhoea, but with our modern diet it is prone to keep the bad bacteria in. Here doctors say that up until about 20 years old they try to save it, but with fully grown adults they tend to remove it as the infection can be life threatening. After the surgery the doctor told me it was ready to burst, so it was a good call.