I expect someone knowledgeable will be along soon (I don't know about B12, MCV etc), but in the meantime, have you thought about joining the Perncious Anaemia forum, as they will surely be able to help. healthunlocked.com/pasoc
I am interested though in your comment that your thyroid results are pretty perfect. Your FT3 is slightly over range. Is your endo ok with that?
"Mean corpuscular volume (MCV) is a measurement of the average size of your RBCs. The MCV is elevated when your RBCs are larger than normal (macrocytic), for example in anaemia caused by vitamin B12 deficiency or folic acid deficiency. When the MCV is decreased, your RBCs are smaller than normal (microcytic), which may indicate iron deficiency anaemia, inflammation or occasionally thalassaemias."
Your folate is a little low, it should be at least half way through it's range which would be at least 9.5. After you start your B12 injections you should supplement also with a B Complex to balance the B vits. Buy one with methylfolate rather than folic acid and avoid cheap supermarket brands, Boots and Holland and Barrett as they tend to use cheap ingredients and frequently the wrong form.
As for your Hashi's, are you strictly gluten free and supplementing with selenium L-selenomethionine 200mcg daily?
"There are numerous studies finding that selenium supplementation reduces thyroid autoimmune antibodies. A study of 80 women with Hashimoto’s disease found that supplementation of 200 mcg of selenomethionine reduced anti-TPO antibodies by 21%,[22. Contempre, B., et al. ......"
Yes, selenium is an essential trace mineral important for the thyroid gland. Selenium deficiency has been implicated in the etiology of Hashimoto’s thyroiditis, and selenium supplementation has been found beneficial...... "
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