Why would my B12 stop absorbing and then ten years later start absorbing again?

Over the past 13 years, I had been very ill. I had a full hysterectomy in 2008. Before that the doctors said that there was no sign of menopause or peri-menopause. Afterwards, I was still very ill. Then a doctor did a full panel on me and found that my b12 did not register. I started on b12 shots and immediately got better. Now, years later, my b12 is suddenly reading in the middle numbers...Why?

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Wishingwellguy · 46-50, M

B12 , is a red blood cell reactive supplement, and if you have a high white cell could for example after a organ removal or drop in function it drops and absorbs much quicker and so it is less likely to show up on blood markers , but as health and motabalism inproves the levels rise ans b12 becone more effective , i had weight lodd surgrey took 2-3 yesr to become effective c despite 6 weekly injections

LILY61

@Wishingwellguy but the problem started years before the surgery and continued for years after even after the shots. it took years to get the number in the middle and my white and red cells where in the middle the whole time and i had no other signs of anemia.