What is Bone island and high B12 mean

Patient : Hi... My name is Linda and I am 34 yrs of age... I have been getting a Blood check every 6mth because my GP wants to monitor my Vit B12 and RBC Folate because there always extremely high... I have cut bread and wheat from diet and I take no Vitamins never have.. Last week my GP requested I get a CT scan on my lower back spine ( I have bad back pain) the test came back showing I have bulging disk L3/4 and L4/5 and also a sceltoric focus measuring 10mm on the right side consistent to a begin bone island... I also have multiple nodules in my Thyroid which I get checked every yr including biopsy.. I getting tired of been treated like a Guinea Pig and would like a dr to just explain what all this means... What is a bone island and what does your B12 mean. Thanks
Symptoms:  pain dizzy
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