I've been ill with vague symptoms for several months - my GP has decided it's anxiety, but I'm convinced there's something physical at the root of it. I've had basic blood tests but surely there are other possibilities - like thyroid problems for example? I just feel ill all the time. I sleep badly and wake up feeling sick, with a white-coated tongue. I have diarrhoea every morning. I feel tired all the time. I've tried so hard to pull myself out of it - I force myself to exercise, I eat really well and take a load of vitamins, but I just keep on feeling terrible. I can't help feeling there must be a simple, physical explanation for all this. Are there tests I should ask my GP to do?