I have a long long history of iron deficient anemia - often quite severe but very responsive to standard iron tablets. I have been monitored closely for the past 2 years for TSH, B12 and haemaglobinopathies. My TSH is rising but has still been in range, free T3, T4 are bottom of range and my B12 has been normal throughout.
In November, my HB suddenly dropped to 85 but I was fairly symptom free. My ferritin was low so I started ferrous fumarate daily but, despite this, my most recent bloods show an HB of just 78 and a sudden significant drop in B12. I have to see my GP next week, she has repeated my thyroid function and doubtless I will need to supplement. Is it usual for B12 to suddenly tumble in this way? I am a vegetarian but eat large amounts of bread and dairy products. I feel pretty unwell as you can imagine, it's a different feeling from iron deficiency.
Thanks for reading. Clare