I turn up at the GP surgery, see some obviously very ill folk, feel guilty and after the usual wait & mindless magazine, I forget & wonder why I'm there, despite writing things down like always cold, always tired, struggling with ordinary things at work, no energy, no appetite or inclination to do anything much, just survive. I can't get my feelings across - and always get offered ADs (I refuse and go, and I pay for my own tests like Vit D and B12, which sadly are ignored too). Perhaps keeping a diary would help. IMHO GPs are trained to spot acute not chronic disease.
It may help if you had someone with you who knows what's going on, even if they only remember what the doc said! (let me know if you find someone - I will borrow them!) J
I'm hoping someone 'assertive' who has got over this obstacle and can describe symptoms successfully, will chip in to help.