I'll start by giving some background to the problem I have. I began suffering with symptoms of tiredness and weakness in September 2007. Since then I have suffered from symptoms including nausea and vomiting, intermittant diarrhoea, extreme tiredness (I can sleep up to 16 hours solid), fainting, muscle cramps and stiffness, loss of appetite, itchy skin which comes out in a rash if I scratch, and weight loss which has accelerated over the last few weeks.