This is for my mum in UK. She is 74, diabetic x 20 years (insulin 2 x day) Her B12 last Oct was 243g/l (range 190-660) so GP refused to do anything. I gave her sublingual B12 which have helped a lot in the beginning, but less now. Her recent serum B12 was a bit under 2000 so GP told her to stop, but she hasn't. She had gallbladder removed in 1965. Symptoms now: legs feel weak, dizzy, loses balance easily, forgetful, depressed at times, sore itchy scalp, painful joints but she is overweight too. Her recent TSH was 3.3 and her free T4 was 12. Just wondering if I should talk to her GP about possible thyroid problem? Any advice would be great. What reaction can I expect from her GP? I live abroad so can't check NICE guidelines myself. Thank you.