I just thought I'd share my result as I have promised a few of you to update.
I recently took the St Thomas's (as per thyroid UK) Vitamin B12 test hoping that it being low might be another missing piece in helping my recovery from anxiety and depression. The range was 25-108 and mine was 120, so outside the reference range but high. So I have to say B12 is optimal. My Methylmalonic Acid was in range to at 110 (0-280).
I had been feeling a little better on my 30mg mirtazapine (anti-dep) and 25mcg thyroxine, probably the last 2-3 weeks but in the last days I have woken feeling low and anxious with my confidence wiped out. There is no rhyme or reason to it. There was a sun shining in my heart one day. And the next it was replaced with a black cloud.
At the end of the month, I am going to up my thyroxine to 50mcg, several of you on here think it's too low (I have raised antibodies but nothing else and family history of hash's). The endo was happy for me to do this and I know I have a blood test planned for the end of the month prior to seeing him in October. Can't think what else to do...