I have suffered from symptoms which I now believe are due to Hypothyroidism for near 8 years. I asked my GP to test my thyroid recently and was told that my results were normal, they were as follows... TSH 0.67 (0.3-4.2). FT4 12.8 (9.0-23.0)? After posting here and getting lots of feedback I pushed my GP for further testing and have just had a blood test for thyroid autoantibodies, Prolactin and Free T3. She also tested ESR, Ferritin (? Low iron), Iron studies (? Overload), B12, folate, coeliac screen. I know the range is important but roughly what should I be looking for in relation to T3? I'm really suffering and am hoping that my doctor will agree to give me a trial of meds to increase my T4 as people here have suggested that that is where my problem might lie. My symptoms are debilitating, I'd try anything. Not sure my GP will go for it though, she does mot think it's my thyroid as she says my results are normal. My symptoms are severe fatigue, hair loss, change in hair texture (dry brittle hair), dry skin patches, definite brain fog and depression which I believe is due to my situation, muscle pain, joint pain, occasional swelling (water retention).