Been on Thyroxine for 20 years. Doc reduced dose in August and I have had lots of trouble since. Fibromyalgia got worse, gained weight and am now having problems with my hands - very stiff and painful. Going to see Doctor next week and I want to know what blood tests I should ask for apart from T4 and T3. Should I get b12 and iron levels checked too? Any hormone tests (I am 55 and still menstruating but not regularly). All advice greatly appreciated.