Thanks to the advice given by members of this forum went back to my GP - well actually another GP in the practice who I've never seen before. He was recommended by friends as someone who listens, and bingo! Agreed, upon listening to my symptoms, to test for vit D, B12, folate, ferritin, iron, plus a test of my female hormones (I'm 48), which no one has agreed to do before. Said then, if results not conclusive, will refer me to an Endocrinologist as "rarely, but sometimes, people have a problem with conversion to T3 and you may need specialist help". Nearly fell off my chair. Just wanted to say thanks to all of you who got back to me and empowered me to try again. Still have to wait for blood test and then analysis after but at least something is happening. We all need to keep fighting. This community helps you to do that and informs you. Don't give up.